Supervisory Or Control Line Signaling Patents (Class 379/350)
- Conversion of signal form (Class 379/353)
- With called number display (Class 379/354)
- Repertory or abbreviated call signal generation (Class 379/355.01)
- Voice frequency band signalling (e.g., reed devices) (Class 379/360)
- Pulse signal generator (e.g., rotary dial) (Class 379/362)
- Plural-switch number input device (e.g., keypad) (Class 379/368)
- Detail of mounting of switch pad or dial (Class 379/369)
- Magneto signalling (Class 379/371)
- With current controlling electromagnetic core device (e.g., Hall-effect device) (Class 379/378)
- With optical link between line and switching system (Class 379/379)
- By bridge circuit (Class 379/380)
- Busy test or make busy (Class 379/381)
- For ring trip or polarity reversal detection (Class 379/382)
- Of plural lines (Class 379/383)
- Relayless (Class 379/385)