FR848445A - Telephone installation - Google Patents

Telephone installation

Info

Publication number
FR848445A
FR848445A FR848445DA FR848445A FR 848445 A FR848445 A FR 848445A FR 848445D A FR848445D A FR 848445DA FR 848445 A FR848445 A FR 848445A
Authority
FR
France
Prior art keywords
telephone installation
telephone
installation
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
Other languages
French (fr)
Inventor
Fritz Oestrich
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 filed Critical
Application granted granted Critical
Publication of FR848445A publication Critical patent/FR848445A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/02—Constructional features of telephone sets
    • H04M1/21—Combinations with auxiliary equipment, e.g. with clocks or memoranda pads
    • H04M1/215—Combinations with auxiliary equipment, e.g. with clocks or memoranda pads by non-intrusive coupling means, e.g. acoustic couplers

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
FR848445D 1938-08-09 1939-01-04 Telephone installation Expired FR848445A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
BE848445X 1938-08-09

Publications (1)

Publication Number Publication Date
FR848445A true FR848445A (en) 1939-10-30

Family

ID=3882062

Family Applications (1)

Application Number Title Priority Date Filing Date
FR848445D Expired FR848445A (en) 1938-08-09 1939-01-04 Telephone installation

Country Status (1)

Country Link
FR (1) FR848445A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE950920C (en) * 1950-06-08 1956-10-18 John Charles Sydney Branson Amplifier device for placing a telephoner for the purpose of hands-free conversation

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE950920C (en) * 1950-06-08 1956-10-18 John Charles Sydney Branson Amplifier device for placing a telephoner for the purpose of hands-free conversation

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