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)
  • Interconnected Communication Systems, Intercoms, And Interphones (AREA)
  • Telephone Set Structure (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 (enrdf_load_html_response)
FR (1) FR829468A (enrdf_load_html_response)
GB (1) GB512043A (enrdf_load_html_response)

Also Published As

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

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