178 / | HD | TELEGRAPHY |
|
2 R | | SYSTEMS {21} |
3 | DF | .~> Automatic {4} |
18.01 | DF | .~> Position coordinate determination for writing (e.g., writing digitizer pad, stylus, or circuitry) {4} |
21 | DF | .~> Stenographic |
23 R | DF | .~> Printing {8} |
43 | DF | .~> Space induction |
45 | DF | .~> Loaded circuit {1} |
47 | DF | .~> Harmonic or reed {1} |
49 | DF | .~> Superposed current |
62 | DF | .~> Chemical |
63 R | DF | .~> Cable or capacity {6} |
64 | DF | .~> Coil transformer |
65 | DF | .~> Dynamo |
66.1 | DF | .~> Alternating or pulsating current {4} |
69 R | DF | .~> Line-clearing and circuit maintenance {12} |
69.6 | DF | .~> Call |
2 A | DF | .~> Simplex-reversing periodic |
2 B | DF | .~> Code changers |
2 C | DF | .~> Way stations; party lines |
2 D | DF | .~> Round robins |
2 E | DF | .~> Satellite |
2 F | DF | .~> Coin-controlled, connecting, recording |