Each of a plurality of changeover switches is provided at a corresponding one of a plurality of signalling stations and has a first contact terminal connected to the positive polarity terminal of a DC voltage source and a second contact terminal connected to the negative polarity terminal of the DC voltage source. Each of the plurality of transistor circuits is provided at a corresponding one of the signalling stations. Each transistor circuit comprises a PNP type transistor and an NPN type transistor connected in parallel with each other and connected to the fixed terminal of the switch arm of the corresponding one of the changeover switches. Each transistor circuit is electrically connected to a bus bar for applying a potential between the potentials of the terminals of the DC voltage source via the control winding of the corresponding one of the magnetic cores. Each transistor of each transistor circuit has a base electrode coupled to a counter via a decoder. The counter is controlled by a pulse generator.
A system for detecting data such as telecommunication calls, alarm calls, fire calls in which the rapidity of the locating of data is obtained by a simultaneous detection at several levels is disclosed. It comprises a meshed network having several levels, a counter which locates the data at that level being related to each level, the counters progressing successively under the control of a supervising element and being blocked each in turn by that element when a data item is detected at the corresponding level. The invention is applicable, to great advantage, in telecommunications and alarm systems.
3825935 - ELECTRICAL SIGNAL REGISTER - Owned by H. Dutton Hayward, Trustee of the Hilda Trusts (Tacoma, WA) Schulein; Joseph (Vancouver, WA) Schulein; Margaret A. (Vancouver, WA)
Apparatus in an electrical signaling system for registering or making a record of signals produced by a plurality of remote signaling devices. The apparatus includes memory circuitry that immediately notes, and remembers, which, if any, devices have transmitted signals, search circuitry which recurrently searches the memory circuitry for such information, and printing mechanism which is actuated immediately in response to information thus uncovered by the search circuitry to print a permanent record reflecting such information. Searching of the memory circuitry stops during intervals of operation of the printing mechanism.
