BE749241A - Perfectionnements aux systemes d'intercommunication - Google Patents

Perfectionnements aux systemes d'intercommunication

Info

Publication number
BE749241A
BE749241A BE749241DA BE749241A BE 749241 A BE749241 A BE 749241A BE 749241D A BE749241D A BE 749241DA BE 749241 A BE749241 A BE 749241A
Authority
BE
Belgium
Prior art keywords
intercommunication systems
intercommunication
systems
Prior art date
Application number
Other languages
English (en)
Inventor
E Pinede
Original Assignee
Int Standard Electric Corp
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 Int Standard Electric Corp filed Critical Int Standard Electric Corp
Publication of BE749241A publication Critical patent/BE749241A/fr

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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q1/00—Details of selecting apparatus or arrangements
    • H04Q1/18—Electrical details
    • H04Q1/30—Signalling arrangements; Manipulation of signalling currents

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Interconnected Communication Systems, Intercoms, And Interphones (AREA)
  • Telephonic Communication Services (AREA)
BE749241D 1969-04-23 1970-04-21 Perfectionnements aux systemes d'intercommunication BE749241A (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CA049568A CA920258A (en) 1969-04-23 1969-04-23 Key telephone systems using pushbutton or rotary dials

Publications (1)

Publication Number Publication Date
BE749241A true BE749241A (fr) 1970-10-21

Family

ID=4085174

Family Applications (1)

Application Number Title Priority Date Filing Date
BE749241D BE749241A (fr) 1969-04-23 1970-04-21 Perfectionnements aux systemes d'intercommunication

Country Status (6)

Country Link
US (1) US3609249A (fr)
BE (1) BE749241A (fr)
CA (1) CA920258A (fr)
CH (1) CH529494A (fr)
ES (1) ES378912A1 (fr)
GB (1) GB1272723A (fr)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE791689A (fr) * 1971-11-24 1973-03-16 Western Electric Co Circuit de ligne telephonique
JPS4916309A (fr) * 1972-05-18 1974-02-13
JPS4996615A (fr) * 1973-01-13 1974-09-12
GB1480341A (en) * 1973-10-25 1977-07-20 Gen Electric Co Ltd Electric impulse transmitters for telephone instruments
US4048450A (en) * 1974-10-25 1977-09-13 Bernard Jean Michel Trunk circuit traffic analyzer
US4029909A (en) * 1976-03-23 1977-06-14 International Telephone And Telegraph Corporation Operator supervisory circuit for a key telephone system
US4158110A (en) * 1977-08-25 1979-06-12 Tone Commander Systems, Inc. Tone selective key telephone intercom system including digital tone detector
CN118138572B (zh) * 2024-05-07 2024-08-27 宁波菊风系统软件有限公司 监控视频的传输方法、装置、设备及程序产品

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3143602A (en) * 1961-05-19 1964-08-04 Bell Telephone Labor Inc Multifrequency signal receiver
US3111185A (en) * 1961-06-30 1963-11-19 Butler Oscar Control system for public carrier vehicles
US3328530A (en) * 1963-10-10 1967-06-27 Automatic Elect Lab Director system with time division access of a common translator

Also Published As

Publication number Publication date
GB1272723A (en) 1972-05-03
US3609249A (en) 1971-09-28
ES378912A1 (es) 1972-08-01
CH529494A (de) 1972-10-15
CA920258A (en) 1973-01-30

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