FR881900A - Sound recording and reproducing device - Google Patents

Sound recording and reproducing device

Info

Publication number
FR881900A
FR881900A FR881900DA FR881900A FR 881900 A FR881900 A FR 881900A FR 881900D A FR881900D A FR 881900DA FR 881900 A FR881900 A FR 881900A
Authority
FR
France
Prior art keywords
reproducing device
sound recording
sound
recording
reproducing
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 FR881900A publication Critical patent/FR881900A/en
Expired legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
FR881900D 1940-04-03 1941-03-28 Sound recording and reproducing device Expired FR881900A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US881900XA 1940-04-03 1940-04-03

Publications (1)

Publication Number Publication Date
FR881900A true FR881900A (en) 1943-05-11

Family

ID=22209898

Family Applications (1)

Application Number Title Priority Date Filing Date
FR881900D Expired FR881900A (en) 1940-04-03 1941-03-28 Sound recording and reproducing device

Country Status (1)

Country Link
FR (1) FR881900A (en)

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