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Page Title:
Table 1-4. Class Designation Letters |
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 T.O. 10M1-8-4-4 AIR FORCE
TM 11-5895-1044-24P ARMY
TM SL-4-08419A
MARINE CORPS
Table 1-4. Class Designation Letters (Continued)
P
Connector, plug, electrical
TR
Transmitter, radio
Disconnecting device (connector, plug)
U
Integrated circuit package
Plug, electrical (connector, movable portion)
V
Barrier photocell
Waveguide flange (plain)
Electron tube
Pliototube
PS
Inverter, static (dc to ac)
Photoelectric cell
Power supply
VR
Crystal diode, breakdown
Thermogenerator
Regulator, voltage (excluding electron
tube)
PU
Eraser, magnetic
W
Bus bar
Recording head
Cable
Waveguide
Q
Transistor
Wire
Rectifier, semiconductor controlled
WT
Tiepoint, wiring
Switch, semiconductor
X
Followed by reference designation of
Triode thyristor
mounted part
XF
R
Potentiometer
XDS
Lampholder
Resistor
XV
Electron tube socket
Rheostat
Y
Crystal unit
Shunt, instrument
Resonator, tuning fork
RE
Receiver, radio
Z
Cavity, tuned
Mode suppressor
RT
Ballast lamp
Network, general (where specific class
Ballast tube
letters do not fit)
Lamp, resistance
Tuned circuit
Thermistor
RV
Varistor
S
Key, telegraph
Switch
Thermostat
SQ
Squib
SR
Slip ring
T
Taper
TB
Terminal board
TC
Thermocouple
TP
Test point
1-12
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