FR724778A - Improvements to devices intended for sound translation - Google Patents

Improvements to devices intended for sound translation

Info

Publication number
FR724778A
FR724778A FR724778DA FR724778A FR 724778 A FR724778 A FR 724778A FR 724778D A FR724778D A FR 724778DA FR 724778 A FR724778 A FR 724778A
Authority
FR
France
Prior art keywords
devices intended
sound translation
translation
sound
intended
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.)
Electrical Research Products Inc
Original Assignee
Electrical Research Products 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 Electrical Research Products Inc filed Critical Electrical Research Products Inc
Application granted granted Critical
Publication of FR724778A publication Critical patent/FR724778A/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
    • H04R19/00—Electrostatic transducers
    • H04R19/04—Microphones
FR724778D 1930-10-20 1931-10-20 Improvements to devices intended for sound translation Expired FR724778A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US390175XA 1930-10-20 1930-10-20

Publications (1)

Publication Number Publication Date
FR724778A true FR724778A (en) 1932-05-02

Family

ID=21903208

Family Applications (1)

Application Number Title Priority Date Filing Date
FR724778D Expired FR724778A (en) 1930-10-20 1931-10-20 Improvements to devices intended for sound translation

Country Status (2)

Country Link
FR (1) FR724778A (en)
GB (1) GB390175A (en)

Also Published As

Publication number Publication date
GB390175A (en) 1933-03-29

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