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ES450595A1 - Un circuito de intercomunicacion mejorado. - Google Patents

Un circuito de intercomunicacion mejorado.

Info

Publication number
ES450595A1
ES450595A1 ES450595A ES450595A ES450595A1 ES 450595 A1 ES450595 A1 ES 450595A1 ES 450595 A ES450595 A ES 450595A ES 450595 A ES450595 A ES 450595A ES 450595 A1 ES450595 A1 ES 450595A1
Authority
ES
Spain
Prior art keywords
response
station
intercom
link circuit
call
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
ES450595A
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.)
Nokia Spain SA
Original Assignee
Alcatel Espana SA
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 Alcatel Espana SA filed Critical Alcatel Espana SA
Publication of ES450595A1 publication Critical patent/ES450595A1/es
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M9/00—Arrangements for interconnection not involving centralised switching
    • H04M9/002—Arrangements for interconnection not involving centralised switching with subscriber controlled access to a line, i.e. key telephone systems

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Interconnected Communication Systems, Intercoms, And Interphones (AREA)
ES450595A 1975-08-11 1976-08-10 Un circuito de intercomunicacion mejorado. Expired ES450595A1 (es)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US05/603,397 US4010332A (en) 1975-08-11 1975-08-11 Link circuit for intercom unit

Publications (1)

Publication Number Publication Date
ES450595A1 true ES450595A1 (es) 1977-09-16

Family

ID=24415261

Family Applications (1)

Application Number Title Priority Date Filing Date
ES450595A Expired ES450595A1 (es) 1975-08-11 1976-08-10 Un circuito de intercomunicacion mejorado.

Country Status (4)

Country Link
US (1) US4010332A (es)
BR (1) BR7605129A (es)
CA (1) CA1071784A (es)
ES (1) ES450595A1 (es)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4063047A (en) * 1977-03-04 1977-12-13 Bell Telephone Laboratories, Incorporated Key telephone system multilink hands free answer circuit
US4130737A (en) * 1977-09-28 1978-12-19 Melco Two-link intercom system
US4188511A (en) * 1978-01-27 1980-02-12 Tone Commander Systems, Inc. Multi-link telephone intercom system
US4158112A (en) * 1978-04-27 1979-06-12 Bell Telephone Laboratories, Incorporated Hands-free answer arrangement on intercom for key telephone system

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3299217A (en) * 1963-10-31 1967-01-17 Bell Telephone Labor Inc Auxiliary interconnecting unit for multi-line subscriber telephone system
US3778554A (en) * 1971-05-24 1973-12-11 Bell Telephone Labor Inc Single three-wire-port pbx intercom trunk circuit arrangement
JPS539803B2 (es) * 1973-01-13 1978-04-08
GB1480222A (en) * 1973-10-26 1977-07-20 Gte International Inc Telephone intercommunication system provided with a common communication line to which access is guarded

Also Published As

Publication number Publication date
CA1071784A (en) 1980-02-12
US4010332A (en) 1977-03-01
BR7605129A (pt) 1977-08-02

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Legal Events

Date Code Title Description
FD1A Patent lapsed

Effective date: 19970612