BE431728A - - Google Patents

Info

Publication number
BE431728A
BE431728A BE431728DA BE431728A BE 431728 A BE431728 A BE 431728A BE 431728D A BE431728D A BE 431728DA BE 431728 A BE431728 A BE 431728A
Authority
BE
Belgium
Application number
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.)
Publication of BE431728A publication Critical patent/BE431728A/xx

Links

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04MTELEPHONIC COMMUNICATION
    • H04M3/00Automatic or semi-automatic exchanges
    • H04M3/42Systems providing special services or facilities to subscribers
    • H04M3/56Arrangements for connecting several subscribers to a common circuit, i.e. affording conference facilities

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Interconnected Communication Systems, Intercoms, And Interphones (AREA)
BE431728D 1938-12-20 BE431728A (ko)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CH214506T 1938-12-20

Publications (1)

Publication Number Publication Date
BE431728A true BE431728A (ko)

Family

ID=4448728

Family Applications (1)

Application Number Title Priority Date Filing Date
BE431728D BE431728A (ko) 1938-12-20

Country Status (2)

Country Link
BE (1) BE431728A (ko)
CH (1) CH214506A (ko)

Also Published As

Publication number Publication date
CH214506A (fr) 1941-04-30

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