FR621195A - Silent phone device - Google Patents

Silent phone device

Info

Publication number
FR621195A
FR621195A FR621195DA FR621195A FR 621195 A FR621195 A FR 621195A FR 621195D A FR621195D A FR 621195DA FR 621195 A FR621195 A FR 621195A
Authority
FR
France
Prior art keywords
phone device
silent
silent phone
phone
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
Hippolyte Saunier
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 FR621195A publication Critical patent/FR621195A/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
    • H04M1/19—Arrangements of transmitters, receivers, or complete sets to prevent eavesdropping, to attenuate local noise or to prevent undesired transmission; Mouthpieces or receivers specially adapted therefor

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
FR621195D 1926-09-09 1926-09-09 Silent phone device Expired FR621195A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR621195T 1926-09-09

Publications (1)

Publication Number Publication Date
FR621195A true FR621195A (en) 1927-05-06

Family

ID=8984943

Family Applications (1)

Application Number Title Priority Date Filing Date
FR621195D Expired FR621195A (en) 1926-09-09 1926-09-09 Silent phone device

Country Status (1)

Country Link
FR (1) FR621195A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE912821C (en) * 1935-11-13 1954-06-03 Siemens Ag Facility for voice transmission from noisy rooms

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE912821C (en) * 1935-11-13 1954-06-03 Siemens Ag Facility for voice transmission from noisy rooms

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