FR342840A - Rotating and hygienic diaphragm for phones - Google Patents

Rotating and hygienic diaphragm for phones

Info

Publication number
FR342840A
FR342840A FR342840DA FR342840A FR 342840 A FR342840 A FR 342840A FR 342840D A FR342840D A FR 342840DA FR 342840 A FR342840 A FR 342840A
Authority
FR
France
Prior art keywords
hygienic
phones
diaphragm
rotating
hygienic diaphragm
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
Sidney Churchill-Otton
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SIDNEY CHURCHILL OTTON
Original Assignee
SIDNEY CHURCHILL OTTON
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 by SIDNEY CHURCHILL OTTON filed Critical SIDNEY CHURCHILL OTTON
Application granted granted Critical
Publication of FR342840A publication Critical patent/FR342840A/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)
FR342840D 1904-05-04 1904-05-04 Rotating and hygienic diaphragm for phones Expired FR342840A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR342840T 1904-05-04

Publications (1)

Publication Number Publication Date
FR342840A true FR342840A (en) 1904-09-17

Family

ID=1391815

Family Applications (1)

Application Number Title Priority Date Filing Date
FR342840D Expired FR342840A (en) 1904-05-04 1904-05-04 Rotating and hygienic diaphragm for phones

Country Status (1)

Country Link
FR (1) FR342840A (en)

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