FR832422A - Hygienic protective device for telephone receiving device - Google Patents

Hygienic protective device for telephone receiving device

Info

Publication number
FR832422A
FR832422A FR832422DA FR832422A FR 832422 A FR832422 A FR 832422A FR 832422D A FR832422D A FR 832422DA FR 832422 A FR832422 A FR 832422A
Authority
FR
France
Prior art keywords
telephone receiving
hygienic protective
receiving device
protective device
hygienic
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
Marie Nicolas Adolphe Mehl
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 FR832422A publication Critical patent/FR832422A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/12—Sanitary or hygienic devices for mouthpieces or earpieces, e.g. for protecting against infection

Landscapes

  • Health & Medical Sciences (AREA)
  • Public Health (AREA)
  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
FR832422D 1937-05-04 1937-05-04 Hygienic protective device for telephone receiving device Expired FR832422A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR832422T 1937-05-04

Publications (1)

Publication Number Publication Date
FR832422A true FR832422A (en) 1938-09-27

Family

ID=9295966

Family Applications (1)

Application Number Title Priority Date Filing Date
FR832422D Expired FR832422A (en) 1937-05-04 1937-05-04 Hygienic protective device for telephone receiving device

Country Status (1)

Country Link
FR (1) FR832422A (en)

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