DE2014929A1 - Fernsprechsystem - Google Patents

Fernsprechsystem

Info

Publication number
DE2014929A1
DE2014929A1 DE19702014929 DE2014929A DE2014929A1 DE 2014929 A1 DE2014929 A1 DE 2014929A1 DE 19702014929 DE19702014929 DE 19702014929 DE 2014929 A DE2014929 A DE 2014929A DE 2014929 A1 DE2014929 A1 DE 2014929A1
Authority
DE
Germany
Prior art keywords
circuit
relay
main unit
call
telephone
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.)
Pending
Application number
DE19702014929
Other languages
German (de)
English (en)
Inventor
Hiromoto; Fukumiya Yukio; Aoki Mithuzi; Yokohama; Mama Hiromichi Kanagawa; Kiyomiya (Japan). P
Original Assignee
Hitachi Ltd., Tokio; Hitachi Elec tronics Engineering Co Ltd., Yokohama; (Japan)
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 Hitachi Ltd., Tokio; Hitachi Elec tronics Engineering Co Ltd., Yokohama; (Japan) filed Critical Hitachi Ltd., Tokio; Hitachi Elec tronics Engineering Co Ltd., Yokohama; (Japan)
Publication of DE2014929A1 publication Critical patent/DE2014929A1/de
Pending legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M3/00—Automatic or semi-automatic exchanges
    • H04M3/42—Systems providing special services or facilities to subscribers
    • H04M3/58—Arrangements for transferring received calls from one subscriber to another; Arrangements affording interim conversations between either the calling or the called party and a third party

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Sub-Exchange Stations And Push- Button Telephones (AREA)
DE19702014929 1969-03-31 1970-03-26 Fernsprechsystem Pending DE2014929A1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP44023812A JPS4932003B1 (cg-RX-API-DMAC7.html) 1969-03-31 1969-03-31

Publications (1)

Publication Number Publication Date
DE2014929A1 true DE2014929A1 (de) 1971-01-07

Family

ID=12120736

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19702014929 Pending DE2014929A1 (de) 1969-03-31 1970-03-26 Fernsprechsystem

Country Status (3)

Country Link
US (1) US3703611A (cg-RX-API-DMAC7.html)
JP (1) JPS4932003B1 (cg-RX-API-DMAC7.html)
DE (1) DE2014929A1 (cg-RX-API-DMAC7.html)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3902024A (en) * 1972-04-19 1975-08-26 Iwatsu Electric Co Ltd Originating number control system for key telephone systems
GB1480223A (en) * 1973-10-26 1977-07-20 Gte International Inc Telephone intercommunication system providing common access to a communication line
US3916116A (en) * 1973-12-12 1975-10-28 Bell Telephone Labor Inc Hold bridge circuit
US3898392A (en) * 1974-02-25 1975-08-05 Litton Systems Inc Answer-back assembly for a key telephone system
US3997737A (en) * 1974-11-27 1976-12-14 San/Bar Corporation Security line card circuit
US4280022A (en) * 1978-02-07 1981-07-21 Iwasaki Tsushinki Kabushiki Kaisha Key telephone systems
KR100422456B1 (ko) * 2001-08-27 2004-03-18 현대건설주식회사 이동말뚝의 경계면 응력 측정방법 및 장치
KR102869200B1 (ko) * 2022-10-24 2025-10-13 (주)세아제강 강관 절단장치 및 이를 이용한 강관 절단방법

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2181715A (en) * 1938-01-13 1939-11-28 Dictograph Products Co Inc Secrecy intercommunicating telephone system
US2270915A (en) * 1940-10-16 1942-01-27 Bell Telephone Labor Inc Special service communication system
US2741667A (en) * 1953-02-11 1956-04-10 Commercial Radio Sound Corp Privacy guarded telephone intercommunicating system
US3239610A (en) * 1962-12-26 1966-03-08 Bell Telephone Labor Inc Line circuit for key telephone system
US3420963A (en) * 1965-07-30 1969-01-07 Bell Telephone Labor Inc Communication system line circuit particularly for key telephone systems
US3436488A (en) * 1966-03-17 1969-04-01 Bell Telephone Labor Inc Line circuit for a key telephone system utilizing a single multifunction supervisory relay
US3470322A (en) * 1966-08-12 1969-09-30 Charles F Rice Combination conference connection and call transfer device for telephone subscriber lines

Also Published As

Publication number Publication date
JPS4932003B1 (cg-RX-API-DMAC7.html) 1974-08-27
US3703611A (en) 1972-11-21

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