GB190100740A - Improvements in & connected with Call Lines in Telephone Exchanges. - Google Patents
Improvements in & connected with Call Lines in Telephone Exchanges.Info
- Publication number
- GB190100740A GB190100740A GB190100740DA GB190100740A GB 190100740 A GB190100740 A GB 190100740A GB 190100740D A GB190100740D A GB 190100740DA GB 190100740 A GB190100740 A GB 190100740A
- Authority
- GB
- United Kingdom
- Prior art keywords
- exchanges
- plug
- coil
- battery
- telephone exchanges
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Landscapes
- Telephonic Communication Services (AREA)
Abstract
740. Oppenheimer, H., [Act.-Ges. Mix & Genest]. Jan. 11. Telephone systems.-Relates to the arrangements between two exchanges of a separate call line capable of being used in one direction only. The Figure shows the arrangement at the two exchanges ; t is the extra call line, e being the calling- plug, which operates the annunciator c by the battery g. At the exchange the operator throws over the five-way switch a, completing the circuit through the coil b and battery d. The armature of the coil b now remains attracted as long as the plug e remains in its socket. The switches a and o are for cutting the operators' instruments in and out.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB190100740T | 1901-01-11 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB190100740A true GB190100740A (en) | 1901-11-16 |
Family
ID=32539220
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB190100740D Expired GB190100740A (en) | 1901-01-11 | 1901-01-11 | Improvements in & connected with Call Lines in Telephone Exchanges. |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB190100740A (en) |
-
1901
- 1901-01-11 GB GB190100740D patent/GB190100740A/en not_active Expired
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