GB360354A - Improvements in or relating to telephone systems - Google Patents

Improvements in or relating to telephone systems

Info

Publication number
GB360354A
GB360354A GB1096/30A GB109630A GB360354A GB 360354 A GB360354 A GB 360354A GB 1096/30 A GB1096/30 A GB 1096/30A GB 109630 A GB109630 A GB 109630A GB 360354 A GB360354 A GB 360354A
Authority
GB
United Kingdom
Prior art keywords
relay
over
junction
operates
circuit
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
GB1096/30A
Other languages
English (en)
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.)
Telefonaktiebolaget LM Ericsson AB
Original Assignee
Telefonaktiebolaget LM Ericsson AB
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 Telefonaktiebolaget LM Ericsson AB filed Critical Telefonaktiebolaget LM Ericsson AB
Publication of GB360354A publication Critical patent/GB360354A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M3/00—Automatic or semi-automatic exchanges
    • H04M3/40—Applications of speech amplifiers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q3/00—Selecting arrangements
    • H04Q3/42—Circuit arrangements for indirect selecting controlled by common circuits, e.g. register controller, marker

Landscapes

  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Structure Of Telephone Exchanges (AREA)
  • Monitoring And Testing Of Exchanges (AREA)
GB1096/30A 1929-01-12 1930-04-22 Improvements in or relating to telephone systems Expired GB360354A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE1819685X 1929-01-12

Publications (1)

Publication Number Publication Date
GB360354A true GB360354A (en) 1931-10-22

Family

ID=20423702

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1096/30A Expired GB360354A (en) 1929-01-12 1930-04-22 Improvements in or relating to telephone systems

Country Status (4)

Country Link
US (1) US1819685A (xx)
BE (1) BE366860A (xx)
FR (1) FR687997A (xx)
GB (1) GB360354A (xx)

Also Published As

Publication number Publication date
BE366860A (xx) 1930-02-28
FR687997A (fr) 1930-08-18
US1819685A (en) 1931-08-18

Similar Documents

Publication Publication Date Title
DK142220B (da) Kobling til teleanlaeg i hvilke forbindelsesveje kan benyttes til forskellige arter af informationsoverfoering
US3963875A (en) Universal answer arrangement for a PABX
US2691066A (en) Automatic telephone system
US3542961A (en) Call forwarding equipment for operators
US2335481A (en) Telephone system
US1922237A (en) Automatic telephone system
US2325877A (en) Automatic telephone system
GB295421A (en) Improvements in telephone systems
US2552799A (en) Party line selective signaling system having code and conference call
US2233282A (en) Telephone system
GB360354A (en) Improvements in or relating to telephone systems
US2520130A (en) Night switching for private automatic branch exchanges
US1568039A (en) Telephone-exchange system
US2586534A (en) Private branch exchange trunk circuit
US3513262A (en) All-busy trunk signalling in common control telephone switchboards
US3449527A (en) Control circuit for dial selection of extension telephones
US2302587A (en) Telephone trunking system
US1922232A (en) Telephone system
US2863949A (en) Telephone system
US2686223A (en) Combined toll and local connector
US3534176A (en) Station restriction circuit for private branch exchange
US2529364A (en) System for controlling automatic signaling for telephone lines
US2708692A (en) Toll switching telephone systems
US2506200A (en) Device for selection of groups of lines within automatic telephone exchanges
US3467786A (en) Means for automatic telephone traffic to subscriber's lines in private automatic branch exchanges