GB283971A - Improvements in electric circuits for central telephone offices - Google Patents

Improvements in electric circuits for central telephone offices

Info

Publication number
GB283971A
GB283971A GB1959/28A GB195928A GB283971A GB 283971 A GB283971 A GB 283971A GB 1959/28 A GB1959/28 A GB 1959/28A GB 195928 A GB195928 A GB 195928A GB 283971 A GB283971 A GB 283971A
Authority
GB
United Kingdom
Prior art keywords
relay
over
finders
jan
electric circuits
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
GB1959/28A
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.)
FATME SpA
Original Assignee
FATME SpA
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 FATME SpA filed Critical FATME SpA
Publication of GB283971A publication Critical patent/GB283971A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Interface Circuits In Exchanges (AREA)
  • Monitoring And Testing Of Exchanges (AREA)

Abstract

283,971. Ericsson-Fatme, and Rosa, A. Jan. 20, 1928. [A Specification was laid open to inspection under Sect. 91 of the Acts, Jan. 22, 1928]. Automatic and semi-automatic exchange systems.-A group of finders is controlled by a common relay E connected to the lines A through high and low resistances D, C. On a call occurring, the relay E is energized over B, A, C, D, E and starts the finders. When a finder W meets the calling line, relay G is energized over B, A, C, F. G, locks itself over the b bank and the calling line, and energizes a slow-release relay H to short-circuit the relay E. Relay G may serve as an impulse relay. The Specification as open to inspection under Sect. 91 (3) (a) comprises also means for directly short-circuiting relay E over a contact of relay G. This subject-matter does not appear in the Specification as accepted.
GB1959/28A 1927-01-31 1928-01-20 Improvements in electric circuits for central telephone offices Expired GB283971A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
IT1723524X 1927-01-31

Publications (1)

Publication Number Publication Date
GB283971A true GB283971A (en) 1929-07-22

Family

ID=11434533

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1959/28A Expired GB283971A (en) 1927-01-31 1928-01-20 Improvements in electric circuits for central telephone offices

Country Status (3)

Country Link
US (1) US1723524A (en)
GB (1) GB283971A (en)
NL (1) NL30173C (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE893518C (en) * 1949-01-17 1953-10-15 Philips Nv Circuit arrangement for a telecommunications system

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL63840C (en) * 1945-09-03
NL141296B (en) * 1948-07-02 Thomson Houston Comp Francaise DOPPLER RADAR SYSTEM.
US3156779A (en) * 1960-11-25 1964-11-10 Automatic Elect Lab Line finding arrangement

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE893518C (en) * 1949-01-17 1953-10-15 Philips Nv Circuit arrangement for a telecommunications system

Also Published As

Publication number Publication date
NL30173C (en)
US1723524A (en) 1929-08-06

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