FR785044A - écouteur téléphonique - Google Patents

écouteur téléphonique

Info

Publication number
FR785044A
FR785044A FR785044DA FR785044A FR 785044 A FR785044 A FR 785044A FR 785044D A FR785044D A FR 785044DA FR 785044 A FR785044 A FR 785044A
Authority
FR
France
Prior art keywords
phone earpiece
earpiece
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
English (en)
Inventor
Erich Hausdorf
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 FR785044A publication Critical patent/FR785044A/fr
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)
  • Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
FR785044D 1934-02-02 1935-02-01 écouteur téléphonique Expired FR785044A (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE452572X 1934-02-02

Publications (1)

Publication Number Publication Date
FR785044A true FR785044A (fr) 1935-07-31

Family

ID=6538673

Family Applications (1)

Application Number Title Priority Date Filing Date
FR785044D Expired FR785044A (fr) 1934-02-02 1935-02-01 écouteur téléphonique

Country Status (2)

Country Link
FR (1) FR785044A (fr)
GB (1) GB452572A (fr)

Also Published As

Publication number Publication date
GB452572A (en) 1936-08-25

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