Circuit arrangement for inductive transmission of direct current surges
DE570032C
Contact bank made of stacked, mutually insulated contact segments, especially for flat bank multiple fields in self-connecting telephone systems
DE533138C
Device for setting electromagnetically driven ratchets against ratchet wheels or shift rods
DE519070C
Terminal strip
DE530578C
Circuit arrangement for automatic telephone systems
DE522079C
Relay, the iron circle of which is formed from stamped pieces
DE616356C
Circuit arrangement for telephone systems with several call stations on a common line
DE491117C
Electromagnetic relay, the armature of which is held mechanically in the working position by a rocker attached to the yoke
DE490902C
Telephone desk station
DE544670C
Switching device for telephone stations
DE486088C
Circuit arrangement for night traffic in semi-automatic telephone systems
DE521783C
Circuit arrangement for rapidly responding and rapidly falling electromagnets with a capacitor
DE587348C
Circuit arrangement for dialers with contact track divided into groups
DE486420C
Circuit arrangement for telephone systems
DE500984C
Switching and operation of conversation timers, especially for telephone private branch exchanges
DE474564C
Key strips for telecommunication purposes, especially for operation by the blind
DE553939C
AC relay
DE503151C
Circuit arrangement for telephone extension systems in series connection
DE524663C
Device for pressing around contact springs with bodies made of insulating compound
DE508968C
Continuous charging devices for telecommunications systems, especially for telephone exchanges, in which a voltage monitoring relay is switched on in the battery circuit
