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
Application number
Inventor
Hermann Oppenheimer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Application granted granted Critical
Publication of GB190100740A publication Critical patent/GB190100740A/en
Expired legal-status Critical Current

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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.
GB190100740D 1901-01-11 1901-01-11 Improvements in & connected with Call Lines in Telephone Exchanges. Expired GB190100740A (en)

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)

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