FR690595A - Mute for telephone handsets - Google Patents

Mute for telephone handsets

Info

Publication number
FR690595A
FR690595A FR690595DA FR690595A FR 690595 A FR690595 A FR 690595A FR 690595D A FR690595D A FR 690595DA FR 690595 A FR690595 A FR 690595A
Authority
FR
France
Prior art keywords
mute
telephone handsets
handsets
telephone
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
James-Tiburce-Felix Conti
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 FR690595A publication Critical patent/FR690595A/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
FR690595D 1929-06-13 1929-05-03 Mute for telephone handsets Expired FR690595A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEC43229D DE537196C (en) 1929-06-13 1929-06-13 Sound absorber to be placed on the voice of microphones

Publications (1)

Publication Number Publication Date
FR690595A true FR690595A (en) 1930-09-23

Family

ID=7025277

Family Applications (1)

Application Number Title Priority Date Filing Date
FR690595D Expired FR690595A (en) 1929-06-13 1929-05-03 Mute for telephone handsets

Country Status (3)

Country Link
BE (1) BE368967A (en)
DE (1) DE537196C (en)
FR (1) FR690595A (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2478783A (en) * 1946-06-17 1949-08-09 Louis S Scher Telephone mouthpiece voice silencer with plural silencing chambers
US2566975A (en) * 1947-01-18 1951-09-04 Leo L Beranek Voice silencer
DE888115C (en) * 1950-05-03 1956-10-31 Helmut Dr-Ing E H Junghans Device for the voice-over of telephone sets to prevent eavesdropping

Also Published As

Publication number Publication date
BE368967A (en)
DE537196C (en) 1931-10-30

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