What follows are the subclasses from one class of the Manual of Classification for US patents. As you scroll through the list and encounter a class/subclass of interest, you can jump back to the top and retrieve patent titles by entering the class/subclass in the box below.
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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