FR439641A - Improvements to hygienic protectors for telephone transmitters - Google Patents

Improvements to hygienic protectors for telephone transmitters

Info

Publication number
FR439641A
FR439641A FR439641A FR439641DA FR439641A FR 439641 A FR439641 A FR 439641A FR 439641 A FR439641 A FR 439641A FR 439641D A FR439641D A FR 439641DA FR 439641 A FR439641 A FR 439641A
Authority
FR
France
Prior art keywords
telephone transmitters
protectors
hygienic
hygienic protectors
transmitters
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
FR439641A
Other languages
French (fr)
Inventor
Charles Adams
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Application granted granted Critical
Publication of FR439641A publication Critical patent/FR439641A/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)
  • Telephone Set Structure (AREA)
FR439641A 1911-03-14 1912-02-02 Improvements to hygienic protectors for telephone transmitters Expired FR439641A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US439641XA 1911-03-14 1911-03-14

Publications (1)

Publication Number Publication Date
FR439641A true FR439641A (en) 1912-06-19

Family

ID=32569709

Family Applications (1)

Application Number Title Priority Date Filing Date
FR439641A Expired FR439641A (en) 1911-03-14 1912-02-02 Improvements to hygienic protectors for telephone transmitters

Country Status (2)

Country Link
FR (1) FR439641A (en)
GB (1) GB191202336A (en)

Also Published As

Publication number Publication date
GB191202336A (en) 1912-03-21

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