FR810939A - Microphone refinements - Google Patents

Microphone refinements

Info

Publication number
FR810939A
FR810939A FR810939DA FR810939A FR 810939 A FR810939 A FR 810939A FR 810939D A FR810939D A FR 810939DA FR 810939 A FR810939 A FR 810939A
Authority
FR
France
Prior art keywords
refinements
microphone
microphone refinements
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)
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.)
Associated Electric Laboratories Inc
Original Assignee
Associated Electric Laboratories Inc
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 Associated Electric Laboratories Inc filed Critical Associated Electric Laboratories Inc
Application granted granted Critical
Publication of FR810939A publication Critical patent/FR810939A/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
    • H04R21/00—Variable-resistance transducers
    • H04R21/02—Microphones
    • H04R21/021—Microphones with granular resistance material
FR810939D 1935-09-16 1936-09-14 Microphone refinements Expired FR810939A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US40738A US2149628A (en) 1935-09-16 1935-09-16 Telephone transmitter

Publications (1)

Publication Number Publication Date
FR810939A true FR810939A (en) 1937-04-02

Family

ID=21912660

Family Applications (1)

Application Number Title Priority Date Filing Date
FR810939D Expired FR810939A (en) 1935-09-16 1936-09-14 Microphone refinements

Country Status (3)

Country Link
US (1) US2149628A (en)
FR (1) FR810939A (en)
GB (1) GB479469A (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE484178A (en) * 1947-08-06
US2567368A (en) * 1949-06-09 1951-09-11 Bell Telephone Labor Inc Telephone transmitter
BE547497A (en) * 1955-06-02

Also Published As

Publication number Publication date
US2149628A (en) 1939-03-07
GB479469A (en) 1938-02-07

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