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Class Number: 178
Class Title: TELEGRAPHY
Subclass Subclass
Number Title
1 MISCELLANEOUS
2 R SYSTEMS
3 .Automatic
4 ..Printing
4.1 R ...Remote control
4.1 A ....Radio-controlled
4.1 B ....Called station identification answer back system
4.1 C ....Revertive signaling
15 ..Photographic recorder
16 ..Current reversing
17 R ..Transmitters or recorders
17.5 ...Storing
17 A ...Tape and/or keyboard
17 B ...Tape control
17 C ...Keyboard
17 D ...Light, capacity, pneumatic sensing
17 E ...Overlap
18 .Writing
19 ..Alternating current
20 ..Variable direct current
21 .Stenographic
23 R .Printing
24 ..Bulletin
25 ..Page
26.1 ...Translators
27 ...Selectors
28 ...With type-wheel recorder
29 ....Recorders
30 ..Character elements
31 ..Multiple-line circuit
32 ...With type-wheel recorder
33 R ..Selectors
34 ...With type-wheel recorder
33 MP ...Monopulse
33 A ...Double selectors
35 ..With type-wheel recorder
36 ..Recorders
37 ...Privacy (e.g., mechanical packaging or covering of printed
message)
38 ...With type wheel
39 ....Multiple
40 .....Shifting devices
41 ....Unisons
42 ...Paper guiding or feeding
23 A ..Error detection in printers
43 .Space induction
45 .Loaded circuit
46 ..Loading coils
47 .Harmonic or reed
48 ..Recorders and receivers
49 .Superposed current
62 .Chemicall
63 R .Cable or capacity
63 A ..Cable repeaters
63 B ..Cable transmitters
63 C ..Cable receivers
63 D ..Cable mechanical structure
63 E ..Distortion correction and artificial lines
63 F ..Direction reversing
64 .Coil transformer
65 .Dynamo
66.1 .Alternating or pulsating current
116 ..Spark gap or arc discharge
117 ..Coherer
66.2 ..Transmitter keying
67.1 ..Modified semicycle
69 R .Line-clearing and circuit maintenance
69 M ..Frequency measuring and compensating
69 N ..Precorrectors
69 A ..Distortion measuring
69 B ..Interference neutralizing
69 C ..Balancing duplex cables
69 D ..Zero wander neutralizers
69 E ..Leakage compensation
69 F ..Neutralizing line capactive discharge
69 G ..Monitoring, alarm and pilot signals
69 H ..Reiterative
69 K ..Misc. gas-filled tube circuits
69 L ..Check back
69.6 .Call
2 A .Simplex-reversing periodic
2 B .Code changers
2 C .Way stations; party lines
2 D .Round robins
2 E .Satellite
2 F .Coin-controlled, connecting, recording
70 R REPEATERS
71 R .Automatic in either direction
72 ..Mechanical circuit retainer
73 ..Multiple line
71 A ..Multiplex to simplex and vice versa
71 B ..Multiplex channels
71 C ..Subscriber's equipment in A.C. multiplex
71 D ..A.C. and vacuum tubes
71 E ..Distributor
71 F ..Mechanical
71 G ..Relays only
71 H ..Artificial lines and relays
71 J ..Vacuum tubes and relays
71 K ..Vacuum tubes and gas magnetrons
71 L ..Code transformers
71 M ..Oscillatory
71 N ..One-way repeater switched
71 S ..Generators
71 P ..Magnetic amplifiers
71 Q ..Piezoelectric
71 T ..Supervisory, alarm, monitor
70 A .Relays only
70 B .Vibrating relays
70 C .Rotary distributorss
70 D .Mechanical
70 E .Tuning forks
70 F .Vacuum tubes
70 G ..With rotary distributors
70 H .Gas tubes
70 K ..And distributors
70 M .Magnetic
70 N .Magnetron repeaters
70 P .Photocell
70 Q .Piezoelectric
70 J .Generator
70 S .Having a carrier wave input
70 T .Oscillatory
70 TS .Using transistors
74 CIRCUITS
75 .Manipulating switch
76 .Retarded closer
77 COMBINED INSTRUMENTS
78 .Portable sets
79 CODE TRANSMITTERS
80 .Combined instruments
81 ..With typewriter
82 R .Automatic dot
82 B ..With electromagnet
82 A ..And dash
83 .Rotary contact
84 ..Drum
85 .Oscillating contact
86 .Reciprocating contact
87 .Stylus and tablet
118 RECEIVERS
89 .Code recorders
90 ..Photographic
91 ..Siphon
92 ..Indenting or perforating
93 ..Polarized
94 ..Pyrographic
95 ..Stop mechanisms
96 ..Inking devices
97 ..Double-tape movement
98 .Sounders
99.1 ..Private (e.g., acoustically shielded)
100 ..Augmenting
119 .Optical member
120 .With electron tube or solid-state device
101 KEYS
102 .Multiple contact
103 .Multiple line
104 .Self-closing
105 .Reversible
106 .Shifting contact point
107 .Knife-edge pivot
108 .Horizontal swing
109 .Spring pivot
110 .Finger buttons
111 TAPES
112 .Perforated
114 INSTRUMENT TABLESS
115 LEARNERS' INSTRUMENTS