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GB512043A - Improvements in loud speaker telephone installations - Google Patents

Improvements in loud speaker telephone installations

Info

Publication number
GB512043A
GB512043A GB31501/37A GB3150137A GB512043A GB 512043 A GB512043 A GB 512043A GB 31501/37 A GB31501/37 A GB 31501/37A GB 3150137 A GB3150137 A GB 3150137A GB 512043 A GB512043 A GB 512043A
Authority
GB
United Kingdom
Prior art keywords
hand
cradle
loudspeaker
switch
amplifiers
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
GB31501/37A
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.)
INT TELEPHONLAUTSPRECHER GES M
Original Assignee
INT TELEPHONLAUTSPRECHER GES M
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 TELEPHONLAUTSPRECHER GES M filed Critical INT TELEPHONLAUTSPRECHER GES M
Publication of GB512043A publication Critical patent/GB512043A/en
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
    • H04M9/08—Two-way loud-speaking telephone systems with means for conditioning the signal, e.g. for suppressing echoes for one or both directions of traffic

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Telephone Set Structure (AREA)
  • Interconnected Communication Systems, Intercoms, And Interphones (AREA)
GB31501/37A 1936-11-24 1937-11-16 Improvements in loud speaker telephone installations Expired GB512043A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AT512043X 1936-11-24

Publications (1)

Publication Number Publication Date
GB512043A true GB512043A (en) 1939-08-28

Family

ID=3675609

Family Applications (1)

Application Number Title Priority Date Filing Date
GB31501/37A Expired GB512043A (en) 1936-11-24 1937-11-16 Improvements in loud speaker telephone installations

Country Status (3)

Country Link
BE (1) BE424749A (da)
FR (1) FR829468A (da)
GB (1) GB512043A (da)

Also Published As

Publication number Publication date
FR829468A (fr) 1938-06-28
BE424749A (da)

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