MinXray HF70D User manual
A
п.
4
,
MinXray
HF70D
High
Frequency
Portable
Dental
X-ray
Unit
Operating
Instructions
This
special
purpose
portable
equipment
is
for
dental
radiography
only.
It
is
not
designed,
nor
does
it
meet,
the
Standards
for
any
other
use.
MinXray,
Inc.
3611
Commercial
Avenue
Northbrook,
Hlinois
60062-1822
]
U.S.A.
Tel:
1-847-564-0323
Toll
Free
Tel:
1-800-221-2245(U.S.
and
Canada)
Fax:
1-847-564-9040
Email:
service(Aminxrayinc.com
INSTRUCTION
MANUAL
FOR
BL70
DENTAL
CONE
CAUTION:
This
special
purpose
beam
limiting
device
is
developed
for
use
with
an
intraoral
dental
x-ray
unit
only.
It
is
not
designed,
nor
does
it
meet,
the
Standards
for
any
other
use.
ASSEMBLY:
Carefully
screw
clockwise
the
BL
70
dental
cone
into
the
cone
holder
on
the
front
of the
x-ray
tubehead.
Avoid
cross-threading
the
cone
when
attaching
it
to
the
tubehead
to
prevent leakage
radiation
and
distortion
of the
x-ray
field.
NEVER
OPERATE
THE
X-RAY
UNIT
UNLESS
THE
DENTAL
CONE
IS
ATTACHED.
CHECK:
Confirm
that
there
are
no
cracks
or
chips
on
the
dental
cone.
If
there
are
any
cracks
or
chips
on
the
dental
cone,
replace
it
with
a
new,
intact
cone.
NEVER
OPERATE
THE
X-RAY
UNIT
WITH
A
DAMAGED
DENTAL
CONE.
MinXray,
Inc.
3611
Commercial
Avenue
Northbrook,
Illinois
60062-1822
U.S.A.
Tel:
1-847-564-0323
Toll
Free
Tel:
1-800-221-2245(U.S.
and
Canada)
Fax:
1-847-564-9040
Email:
Introduction
1
Installation
Instructions
|
Unpacking
3
Assembly
Instructions
3
Pre-Operational
Required
Testing
4
Installation
Check
list
7
Operating
Instructions
Operation
8
Safety
Precautions
9
Maintenance
9
Specifications
11
Schematic
Diagram
12
X-ray
Tube
Data
13
Warranty
INTRODUCTION
The
MinXray
model
HF70D
is
a
mono-block
type
high
frequency
portable
dental
x-ray
unit.
The
HF70D
can
be
used
with
conventional
intraoral
dental
film
or
with
solid-state
digital
radiographic
intraoral
sensors.
It is
supplied
in
a
carrying
case
containing
the
x-ray
tubehead/controi,
detachable
dental
cone
(beam
limiting
device),
detachable
AC
power
cord,
and
detachable
exposure
cord with
2-stage
exposure
switch.
The
HF'70D
is
designed
to
be
easily
attached
to
the
model
X100S
adjustable
tripod
stand.
CARELESS
OR
IMPROPER
USE
OF
X-RAY
EQUIPMENT
CAN
BE
EXTREMELY
HAZARDOUS.
It
is
imperative
that
this
equipment
be
operated
and
serviced
only
by
trained
personnel
familiar
with
the
safety
precautions
required
to
prevent
excessive
exposure
to
primary
X-ray
radiation,
the
dangers
of
exposure
to
X-
ray
radiation,
and
the
proper
use
of
the
equipment
discussed
in
this
manual.
All
personnel
authorized
to
operate
or
service
this
equipment
should
be
fully
acquainted
with
the
established
maximum
permissible
doses,
safety
recommendations,
and
procedures
derived
from
the
following
sources:
A.
National
Council
on
Radiation
Protection
Report
No.33
(Medical
X-Ray
and
Gamma
Ray
Protection
for
Energies
up
to
10
MEV
-
Equipment
Design
and
Use);
from
NRCP
Publications;
P.O.
Box
30175,
Washington,
D.C.
20014.
B.
National
Bureau
of
Standards
Handbook
No.76
(Medical
X-Ray
Protection
up
to
Three
Million
Voits);
from
the
Superintendent
of
Documents,
Government
Printing
Office,
Washington,
D.C.
20401.
C.
All
documents
relating
to
the
Performance
Standard
for
Diagnostic
X-Ray
Systems,
21
CFR
Subchapter
J,
Part
1020;
obtainable
from
FDA
Center
for
Devices
and
Radiological
Health,
Department
of
HHS,
2098
Gaither
Road,
Rockville,
MD
20850.
D.
State
and
local
regulations
governing
radiation
protection
and
the
use
of
diagnostic
X-ray
equipment.
E.
Requirements
of
the
user’s
in-house
radiation
protection
program.
F.
Instructions
and
precautionary
notices
of
this
manual.
Although
this
equipment
incorporates
protective
design
features
for
limiting
both
the
direct
(primary)
x-ray
beam
and
the
secondary
radiation
produced
by
this
beam,
design
factors
alone
cannot
prevent
human
carelessness,
negligence,
or
lack
of
knowledge.
This
apparatus
is
sold
with
the
understanding
that
the
user
assumes
sole
responsibility
for
radiation
safety
and
that
MinXray,
Inc.,
its
agents
and
representatives,
do
not
accept
any
responsibility
for:
A.
B.
v
o
Injury
or
danger
to
patient
or
other
personnel
from
x-ray
exposure.
Overexposure
due
to
poor
operating
techniques
or
procedures.
Equipment
not
properly
serviced
or
maintained
in
accordance
with
this
manual.
Equipment
which
has
been
modified
or
tampered
with
in
any
way.
Equipment
that
has
been
connected
to
input
voltage
other
than
the
voltage
specified
on
the
rating
label
affixed
to
the
x-ray
unit.
MinXray
HF70D
INSTALLATION
INSTRUCTIONS
Unpacking
The
MinXray
AF70D
portable
x-ray
unit
consists
of an
x-ray
tubehead
and
control,
mounting
handle,
dental
cone,
exposure
cord,
power
cord,
and
carrying
case.
If
a
stand
is
purchased
with
the
HF70D,
instructions
for
its
assembly
are
included
with
the
stand.
When
the
equipment
is
received
each
shipping
container
should
be
carefully
examined
for
any
evidence
of
mishandling
during
shipment:
Note
its
condition,
if
abnormal,
carefully
unpack
all
parts
and
examine
for
damage.
If
any
damage
is
noted,
immediately
report
it
to
the
carrier
in
the
proper
manner,
by
personally
calling
it
to
attention
by
phone
where
possible,
and
filing
a
written
report.
All
printed
matter
supplied
with
the
HF70D
should
be
saved
for
reference
during
installation
and
operation.
Assembly
Instructions
1.
Remove
the
HF70D,
dental cone,
power
cord,
and
exposure
cord
from
the
carrying
case.
2.
Ifthe
HF70D
will
be
attached
to
the
top
of
the
center
post
of
the
X100S
tripod
stand,
rotate
the
carrying
handie
of
the
HF70D
around
the
rear
of the
unit
so
it
is
positioned
under
the
unit.
Place
one
flat
black
rubber
washer
on
the
thread
stud
on
the
center
post
of
the
tripod.
Insert
the
threaded
stud
on
the
center
post
of
the
tripod
through
the
hole
in
the
center
of
the
carrying
handle
ofthe
HF70D.
Place
the
second
flat
black
rubber
washer
on
the
stud
of
the
tripod
center
post
and
on
top
of
the
HF70D
carrying
handle.
Affix
the
HF70D
to
the
tripod
using
the
brass
thumb
nut.
Adjust
the
length
of
each
telescoping
tripod
leg,
and
lock
it.
Adjust
the
height
of
the
center
post
and
lock
it
-3-
っ
3.
Carefully
screw
the
dental
cone
into
the
cone
holder
on
the
front
of
the
HF70D.
Avoid
cross-
threading
the
cone
when
attaching
it
to
the
HF70D.
NEVER
OPERATE
THE
HF70D
UNLESS
THE
DENTAL
CONE
IS
ATTACHED.
4.
Connect
the
AC
power
cord
to
the
socket
on
the
back
of the
HF70D.
Note
the
rated
voltage
of
the
HF70D
before
connecting
it
to
a
power
source.
5.
Connect
the
exposure
cord
to
the
RJ11
telephone-type
socket
on
the
back
of
the
HF70D.
PRE-OPERATIONAL
REQUIRED
TESTING
The
following
test
is
the
responsibility
of
the
dealer
and
must
be
conducted
without
fail.
Fill
out
the
checklist
for
this
report,
when
installation
of
x-ray
unit
is
complete.
1.
EXPOSURE
TIMER
1-1
Test
method:
1.
Set
HF
70D
exposure
timer
to
0.02
sec.
.
Set
HF70D
output
to
70kV.
.
Set
NERO
to
the
following
settings.
SID:
18
inches;
Wheel
range:
50
~
85kV;
Sensitivity:
Low;
Phase
select:
10;
Measurement
mode:
STAT;
X-ray
values:
70kV,
0.02
sec.
.
Make
exposure
and
read
the
measured
value
of
exposure
time
on
the
NERO.
.
Measure
value
of
exposure
time
at
following
settings
with
same
procedure:
0.02,
0.04,
0.10,
0.20,
0.50,
and
1.00
sec.
La
D
Un
de
1-2
Instruments:
NERO
Model
6000M
x-ray
beam
analyzer
Manufactured
by
Victoreen,
Inc.
or
equivalent
1-3
Rejection
limit:
+20%(0.02
sec.
~
0.2sec.),
+10%(0.22sec.
~
1.98sec.)
If
the
timer
needs
adjustment:
(1)
remove
the
4
screws
on
the
side
of
the
top
cover
of
the
HF70D,
and
lift
the
top
off
of
the
body
of
the
unit;
(2)
adjust
the
potentiometer
"VR1"on
the
printed
circuit
board
M3115
оп
the
inside
of
the
top
cover
(see
Fig.1)
so
that
radiation
exposure
time
equals
the
indicated
time
value,
taking
into
consideration
the
accuracy
tolerances;
(3)
replace
the
top
cover
and
4
screws.
-4-
Fig.
1
.
PEAK
TUBE
POTENTIAL
2-1
Test
method:
1.
Set
HF70D
exposure
timer
to
0.2
sec.,
and
set
kV
to
60kV.
2.
Set
NERO
to
the
following
settings:
SID:
18
inches;
Wheel
range:
50
~
85kV;
Sensitivity
Hi;
Phase
select:
18;
Measurement
mode:
SGL;
Time
delay
0.1sec;
X-ray
values:
60kV,
0.2
sec.
3.
Make
exposure
and
read
the
measured
AVG.
kV
value
on
the
NERO.
4.
Measure
also
value
of
AVG.
kV
at
65kV,
70kV
with
same
procedure.
2-2
Instruments:
NERO
Model
6000M
x-ray
beam
analyzer
Manufactured
by
Victoreen,
Inc.
or
equivalent
2-3
Rejection
limit:
£10%
If
the
peak
tube
potential
needs
adjustment:
(1)
remove
the
4
screws
on
the
side
of
the
top
cover
of
the
HF70D,
and
lift
the
top
off
of
the
body
of
the
unit;
(2)
adjust
the
potentiometer
"VR1"
on
the
printed
circuit
board
M9142
located
on
top
of
the
lower
portion
of
the
unit
(see
Fig.
2)
so
that
peak
tube
potential
equals
the
indicated
kV
value,
taking
into
consideration
the
accuracy
tolerances;
(3)
replace
the
top
cover
and
4
screws.
.
TUBE
CURRENT
3-1
Test
method:
1.
Set
HF70D
to
60kV,
and
timer
to
0.2sec.
2.
Set
oscilloscope
to
the
following
settings.
ch
1:Ep,
ch
2:Ip,
chl
V/div:
IV,
ch2
V/div:
500mV,
sec/div:
25
msec,
trigger
level:
chl
1.5V
3.
Open
the
top
cover
of
the
HF70D
by
removing
the
4
screws
and
lifting
the
cover
off
of
the
unit.
Connect
ch
|
of
oscilloscope
to
Ep
pin
of
PC
board
M9142
and
connect
ch
2
of
oscilloscope
to
Ip
pin
of
PC
board
M9142.
Connect
GND
line
of
probe
to
GND
pin
of
PC
board
M9142.
4.
Measure
Hi
value
of
ch
2.
5.
Measure
Hi
value
of ch
2 at
70
kV
and
0.2
sec.
with
same
procedure.
-5-
3-2
Instruments:
Digital
Storage
&
Analog
Oscilloscope
2212
Manufactured
by
Tektoronix
Holland,
N.V.
or
equivaient
3-3
Rejection
limit:
10%
If
the
tube
current
needs
adjustment:
(1)
adjust
the
potentiometer
"VR2"
on
the
printed
circuit
board
M9142
(see
Fig.
2)
so
that
tube
current
equals
10
mA,
taking
into
consideration
the
accuracy
tolerances;
(2)
replace
the
top
cover
and
4
screws.
Fig2
INSTALLATION
CHECK
LIST
INSTALLATION
CHECK
HF70D
LIST
Fill
out
this
checklist
SERIAL
NO.
个
when
installation
js
DATE
complete.
MANUFACTURED
EQUIPMENT
LOCATION
TEST
ACCEPTANCE
RESULTS
CHECK
DESCRIPTION
LIMITS
Line
Voltage
110~130V
ee
eee
V
A
LI
(220~260V)
GO
_NO
GO
Line
Voltage
DI
ns
%
O
O
Regulation
GO
NOGO
Peak
Tube
Potential
60kVE1096
|...
kV
O G
65
KVE10%
ин
kV
GO
NOGO
TO
KVE10%
|...
kV
Tube
Current
10MAT10%
|..........
mA
O o
GO
_
NOGO
Exposure
Time
0.02sec
20%
|
.........
sec
O
O
0.04566
20%
|
.........
sec
GO
NOGO
D.lsec
220%
|
.........
sec
0.2sec
420%
|(..........
sec
0.5sec
10%
o
sec
10sec
=l0%
fn
eee
sec
All
Mechanical
Smooth
Movement
O
a
Movement
GO
_
NO
GO
All
Operation
See
operation
Manual
口
GO_
NO
GO
Instruments
Used
Dealer
Name
Dealer
Address
Assembler
si
Comments
Manufacturer
Model
Last
calibrated
Dealer
Phone
Number
nN
OPERATION
INSTRUCTIONS
Connect
the
AC
power
cord
to
a
grounded
electrical
outlet.
Check
the
label
on
the
HF'70D
for
the
correct
AC
input
voltage
and
amperage
required.
Turn
on
the
main
power
switch
on
the
HF70D.
The
kV
and
sec
LED
displays
will
light
and
remain
on.
The
HF70D
has
internal
circuitry
to
automatically
compensate
for
variations
in
the
input
voltage
to
assure
consistent
kV
and
mA
output.
Select
the
kV
output
by
pressing
the
arrows
below
the
kV
display
to
choose
60, 65,
or
70
kV.
10
mA
output
is
fixed
at
all
kV
settings.
Select
the
exposure
time
by
pressing
the
arrows
below
the sec
display
to
choose
between
0.02
and
1.98
second
exposures.
Position
the
x-ray
unit
for
the
intraoral
image
you
will
be
taking.
The
exposure
switch
has
a
2-stage
button.
The
first
stage
pre-heats
the
filament
of
the
x-ray
tube.
When
this
stage
alone
is
depressed
and
held,
“
READY
”
indicator
will
light
after
1.5
seconds,
indicating
the
filament
was
heated
and
the
unit
is
ready
to
generate
x-rays.
The
second
stage
initiates
the
x-ray
exposure
for
the
time
set
in
the
sec
display.
When
the
second
stage
is
fully
depressed,
x-ray
will be
emitted,
the
X-RAY
indicator
will
light,
and
an
audible
signal
will
be
heard.
PRESS
AND
HOLD
THE
FIRST
AND
SECOND
STAGE
BUTTONS
TOGETHER
UNTIL THE
EXPOSURE
HAS
TERMINATED.
This
is
a
“dead
man”
exposure
switch--x-ray
exposure
will
terminate
immediately
as
a
safety
feature
when
the
buttons
are
released.
7.
After
each
exposure,
release
the
exposure
buttons.
The
HF70D
is
now
ready
for
the
next
exposure.
8.
When
you
are
finished
using
the
HF70D,
turn
off
the
main
power
switch,
disconnect
the
AC
power
cord
and
exposure
cord,
unscrew
the
dental
cone,
and
repack
these
components
with
the
HF70D
into
the
carrying
case.
Safety
Precautions
1.
During
exposure
the
operator
must
stand
as
far
as
possible
from
the
patient
being
x-rayed,
and
should
wear
a
lead
apron
or
stand
behind
a
lead
shield.
2.
The
operator
must
not
stand
in
the
primary
x-ray
beam.
3.
The
operator
should
wear
a
monitoring
dosimeter
while
operating
this
unit.
It
should
be
worn
where
it
is
not
covered
by
a
lead
apron.
4,
X-ray
exposure
should
be
kept
as
short
as
possible.
Maintenance
The
following
must
be
checked
before
each
use:
Tubehead
1.
Make
sure
the
certification
and
identification
labels
are
in
place.
2.
Check
for
any
loose
or
missing
screws.
3.
Check
for
oil
leaks.
4.
Check
for
any
physical
damage.
5.
Check
the
kV
adjustment
for
proper
operation.
6.
Check
the
timer
for
proper
operation.
7.
Check
ail
cords
and
cord
connections.
8.
Check
the
exposure
buttons--the
exposure
must
terminate
if
the
button
is
released
during
an
exposure.
Dental
Cone
(beam
limiting
device)
1.
Make
sure
the
certification
label
is
on
the
cone.
2.
Check
for
any
physical
damage.
Indicators
1.
Check
the
X-RAY
indicator
for
proper
operation
when
both
exposure
buttons
are
depressed
and
held.
2.
Make
sure
the
audible
signal
operates
during
an
exposure.
Have
this
unit
checked
by
qualified
service
personnel
immediately
if
any
problems
occur
with
the
HF70D.
-10-
.
Specificati
X-ray
Output
Exposure
Timer
Line
Voltage
Generator
rating
Current
draw
at
10mA,
70
KVDC
out
put.
Inverter
Frequency
Maximum
deviation
from
fixed
factor
X-ray
Tube
Focal
Spot
Exposure
Switch
Exposure
Cord
Power
Cord
Dental
cone
(Beam
Limiting
Device)
Focus
to
Cone
Tip
Distance
Unit
Dimensions
Weight
Stand
10
mA
@
60,
65,
70
kVDC
0.02
-
1.98
seconds,
99
steps
110-130V,
50/60
Hz
220-260V,
50/60
Hz
10
mA
at
70
KVDC
215
%
15
amps
75
kHz
+10%(mA),
+10
%
(kV),
+20
%
(Time:
0.02-0.20
sec.),
+10
%
(Time:
0.22-1.98
sec.),
Toshiba
D-0811
or
equivalent
0.8
mm
Two-stage,
deadman
with
RJ11
connector
8
feet
(2.8
m)
20
feet
(6.1
m), 14/3
wire
oil
resistant
Yoshida
model
BL70
or
equivalent
7.95" (20.2
cm)
4.8"
(12.2cm)
W
x
5.8"
(14.7
cm)
Hx
7.9"
(20.1cm)
L,
plus
dental
cone
9.7
lbs
(4.4
kgs.)
Fits
MinXray
X100S
tripod
The
MinXray
HF70D
is
compatibie
with
all
radiographic
imaging
modalities,
including
digital.
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1189
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T
-12
-
TOSHIBA
7
n
Electron
Tube,
Device
&
Equipment
TECHNICAL
DATA
TOSHIBA
X-RAY
TURE
0-0311,
0-08115
STATIONARY
ANODE
X-RAY
TUBE
4
Especially
designed
for
dental
X-ray
unit.
Y
Provided
with
an
insulation
cylinder
(D-08115).
+
These
tubes
have
focus
0.8
mm,
and
are
avail-"
-
able
for
maximum
tube
voltage
70
kV
with
self-
rectified
circuit.
+
Installed
in
the
same
enclosure
with
the
high
tensian
transformer.
n
|
GENERAL
DATA
ELECTRICAL:
Circuit
eee...
Self-rectified
(Center-grounded)
Operating
Tube
Voltage
|,
,...............,
50
ta
70
kV
Focal
Spot
0.8
ma
Input
Energy
(at
1.0
s)
See
rating
charts
sc,
600
Ἡ
MECHANICAL:
|
Dimensions
4
444
.........,.
See
dimensional
outline
Overall
Length:
x
DOBIL
2
2 2
22
이 이
이이
이이
이이
은은
이 이
2,
,
74
mm
IAB
,,,...,................
Tâ
mn
Max.
Diameter:
DB
이 이
이오
이
이요
이
이외
이 이
의,
,
31
mm
12-08118
.................
0.
38
mo
Target
Angle
,
,.
.
,.
,.
,
,
, , ,
이이
이이
이이
이의
le
16
degrees
Inherent
Filtration
sss,
At
least
0.6
mm
Al
equivalent
at
70
kV
X-ray
Coverage
O
1960-97-18
1
TOSHIBA
CORPORATION
(
-13-
D-0811.D-0811S
Weight
(approx.)
DOBIL
110
g
D-0811S
ee
el
130
g
Cooling
Method
|
|,
,
...........
Qil
immersed
(60
°C
Max.)
and
convection
ail
cooling
Tube
Holding:
2-0811
ll.
Holding
the
glass
envelope
of
the
anode
end
and
cathode
end,
or
the
|
screw
of
the
anade
shank.
D-0811S
Holding
the
insulation
cylinder.
e...
©
©
©
©
8
ㆍ
MAXIMUM
AND
MINIMUM RATINGS
(At
any
time,
these
values
must
not
be
exceeded)
Max.
Tube
Voltage
,
,......................
70
kV
Max.
Inverse
Tube
Voltage
_....................
85
kV
Min.
Tube
Voltage
,
...............
64661.
50
kV
Max.
Tube
Current:
See
rating
charts
,
,................
. . .
.
19
må
Мах.
Filament
Current
3.0
À
Filament
Voltage:
At
max.
Filament
current
(3.0A)
|,
|.
||,
i.
3.0
to
3.7
V
Thermal
Characteristics:
7
kI(
10
kHU
)
210
Я
(300
HU/s)
PI
a...
ㆍ
ㆍ
-14-
D-0811,0-0811S
CAUTIONS
Read
through
this
page
before
using
the
tube.
Since
X-ray
tube
will
emit
%
rays
when
it is
energized
with
high
voltage,
spe-
cial
knowledge
is
required
to
handle
it.
The
items
below
show
general
cautions
for
the
tube
handling.
сл
.
The
tube
shall
be
handled
or
operated
only
by
qualified
personnel.
Only
specialist
who
has
good
knowledge
of
X-ray
tube
should
assemble,
main:
tain
and
remove
the
tube.
.
The
tube
envelope
is
made
of
glass.
In
transporting
and
handling.
sufficient
care
should
be
taken
not
to
give
strong
impact
or
vibration
to
the
tube.
.
Regulations
and
standards
require
the
minimum
source-skin
distance
(SSD)
and
the
minimum
filtration
of
the
useful
beam.
Use
the
tube
after
fulfilling
then.
.
The
tube
might
be
broken
due
to
only
one
overload
operation.
Provide
proper
overload
pratection
circuit.
Operate
the
tube
by
selecting
a
proper
input
condition
according
to
the
conditions
for
operation
and
tube
characteristics
charts.
.
.
If
any
abnormality
is
found
in
using
this
tube,
immediately
switch
off
the
power
supply
and
contact
TOSHIBA
service
department.
.
The
charts
of
this
technical
data
is
indicating
standard
values.
For
usage
nat
described
here
or
for
any
unclear
items,
please
contact
TOSHIBA
service
department
without
hesitation.
D-0811.0-0811S.
MAXIMUM
RATING
CHARTS
(ABSOLUTE
MAXIMUM
RATING
CHARTS)
SELF-RECTIFIED
FOCAL
SPOT
:
0.8
mm
TUBE
CURRENT
(mA)
6
0.1
0.2
0.3
0.5
0.7
1
235
EXPOSURE
TIME
(s)
EMISSION
&
FILAMENT
CHARACTERISTICS
SELF-RECTIFIED
25
ンプ
3.0
Ef
^
20
2.5
ルー
/
15
[7
7
2.0
SOKV
to
70kV
/
10
V
1.5
5
vá
1.0
0
0.5
2.0
2.2
24
26
2.8
3.0
TUBE
CURRENT
(mA)
FILAMENT
VOLTAGE
(V)
FILAMENT
CURRENT
(A)
-16-
D-0811.D-08118
ANODE
THERMAL
CHARACTERISTICS
|
la
一
|
110%
6
7
[A
130
W
HEAT
STORAGE
(kJ)
Lo
>
|
==
a
|
HEATING
=
TAN
LING
0
|
и
6
|
1
3
4
-17-
Table of contents
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