| Class 178 | TELEGRAPHY |
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![[List of Pre Grant Publications for class 178 subclass 1]](../as.gif) | ![[List of Patents for class 178 subclass 1]](../ps.gif) | 1 | MISCELLANEOUS |
| | 2R | SYSTEMS |
| | 3 |  Automatic |
| | 4 |  Printing |
| | 15 | Photographic recorder |
| | 16 | Current reversing |
| | 17R | Transmitters or recorders |
| | 18.01 | Position coordinate determination for writing (e.g., writing digitizer pad, stylus, or circuitry) |
| | 18.02 | Error correction |
| | 18.03 | Writing digitizer pad |
| | 18.04 |  Acoustical (e.g., vibration, ultrasonic, etc.) |
| | 18.05 | Resistive |
| | 18.06 | Capacitive |
| | 18.07 | Inductive |
| | 18.09 | Optical |
| | 18.11 | With illumination |
| | 19.01 | Writing digitizer stylus |
| | 19.02 | Acoustical stylus |
| | 19.03 | Capacitive or inductive stylus |
| | 19.04 | Pressure stylus |
| | 19.05 | Light pen |
| | 19.06 | AC source |
| | 20.01 | Writing digitizer circuit |
| | 21 | Stenographic |
| | 23R | Printing |
| | 24 | Bulletin |
| | 25 | Page |
| | 30 | Character elements |
| | 31 | Multiple-line circuit |
| | 33R | Selectors |
| | 35 | With type-wheel recorder |
| | 36 | Recorders |
| | 37 | Privacy (e.g., mechanical packaging or covering of printed message) |
| | 38 | With type wheel |
| | 42 | Paper guiding or feeding |
| | 23A | Error detection in printers |
| | 43 | Space induction |
| | 45 | Loaded circuit |
| | 47 | Harmonic or reed |
| | 49 | Superposed current |
| | 62 | Chemical |
| | 63R | Cable or capacity |
| | 63A | Cable repeaters |
| | 63B | Cable transmitters |
| | 63C | Cable receivers |
| | 63D | Cable mechanical structure |
| | 63E | Distortion correction and artificial lines |
| | 63F | Direction reversing |
| | 64 | Coil transformer |
| | 65 | Dynamo |
| | 66.1 | Alternating or pulsating current |
| | 69R | Line-clearing and circuit maintenance |
| | 69M | Frequency measuring and compensating |
| | 69N | Precorrectors |
| | 69A | Distortion measuring |
| | 69B | Interference neutralizing |
| | 69C | Balancing duplex cables |
| | 69D | Zero wander neutralizers |
| | 69E | Leakage compensation |
| | 69F | Neutralizing line capactive discharge |
| | 69G | Monitoring, alarm and pilot signals |
| | 69H | Reiterative |
| | 69K | Misc. gas-filled tube circuits |
| | 69L | Check back |
| | 69.6 | Call |
| | 2A | Simplex-reversing periodic |
| | 2B | Code changers |
| | 2C | Way stations; party lines |
| | 2D | Round robins |
| | 2E | Satellite |
| | 2F | Coin-controlled, connecting, recording |
| | 70R | REPEATERS |
| | 71.1 | Automatic in either direction |
| | 72 | Mechanical circuit retainer |
| | 73 | Multiple line |
| | 71.2 | Distributor |
| | 71.3 | Mechanical |
| | 71.4 | Generator |
| | 71.5 | Artificial line and relay |
| | 71.6 | Vacuum tube and gas magnetron |
| | 71.7 | Code transformer |
| | 71.8 | Oscillatory |
| | 71.9 | One-way repeater switched |
| | 71.11 | Piezoelectric |
| | 71.12 | Vacuum tube and relay |
| | 71.13 | Relay only |
| | 71.14 | Supervisory, alarm, monitor |
| | 70A | Relays only |
| | 70B | Vibrating relays |
| | 70C | Rotary distributors |
| | 70D | Mechanical |
| | 70E | Tuning forks |
| | 70F | Vacuum tubes |
| | 70H | Gas tubes |
| | 70M | Magnetic |
| | 70N | Magnetron repeaters |
| | 70P | Photocell |
| | 70Q | Piezoelectric |
| | 70J | Generator |
| | 70S | Having a carrier wave input |
| | 70T | Oscillatory |
| | 70TS | Using transistors |
| | 74 | CIRCUITS |
| | 77 | COMBINED INSTRUMENTS |
| | 79 | CODE TRANSMITTERS |
| | 80 | Combined instruments |
| | 82R | Automatic dot |
| | 83 | Rotary contact |
| | 85 | Oscillating contact |
| | 86 | Reciprocating contact |
| | 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 |
| | 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 |
| | 114 | INSTRUMENT TABLES |
| | 115 | LEARNERS' INSTRUMENTS |
| FOREIGN ART COLLECTIONS | ||
| FOR000 | CLASS-RELATED FOREIGN DOCUMENTS |
| Any foreign patents or non-patent literature from subclasses that have been reclassified have been transferred directly to FOR Collections listed below. These Collections contain ONLY foreign patents or non-patent literature. The parenthetical references in the Collection titles refer to the abolished subclasses from which these Collections were derived. | ||
| SYSTEMS |