BE368967A - - Google Patents

Info

Publication number
BE368967A
BE368967A BE368967DA BE368967A BE 368967 A BE368967 A BE 368967A BE 368967D A BE368967D A BE 368967DA BE 368967 A BE368967 A BE 368967A
Authority
BE
Belgium
Application number
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.)
Publication of BE368967A publication Critical patent/BE368967A/xx

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)
  • Duct Arrangements (AREA)
BE368967D 1929-06-13 BE368967A (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DEC43229D DE537196C (de) 1929-06-13 1929-06-13 Schalldaempfer zum Aufsetzen auf die Einsprache von Mikrotelefonen

Publications (1)

Publication Number Publication Date
BE368967A true BE368967A (de)

Family

ID=7025277

Family Applications (1)

Application Number Title Priority Date Filing Date
BE368967D BE368967A (de) 1929-06-13

Country Status (3)

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

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 (de) * 1950-05-03 1956-10-31 Helmut Dr-Ing E H Junghans Vorrichtung an der Einsprache von Fernsprechapparaten zur Verhinderung des Mithoerens

Also Published As

Publication number Publication date
FR690595A (fr) 1930-09-23
DE537196C (de) 1931-10-30

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