FR821569A - Public utility sound device - Google Patents

Public utility sound device

Info

Publication number
FR821569A
FR821569A FR821569DA FR821569A FR 821569 A FR821569 A FR 821569A FR 821569D A FR821569D A FR 821569DA FR 821569 A FR821569 A FR 821569A
Authority
FR
France
Prior art keywords
sound device
public utility
public
utility
sound
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
Dhayton-Dzieciolowsk Alexandre
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 filed Critical
Application granted granted Critical
Publication of FR821569A publication Critical patent/FR821569A/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
FR821569D 1936-08-14 1936-08-14 Public utility sound device Expired FR821569A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR821569T 1936-08-14

Publications (1)

Publication Number Publication Date
FR821569A true FR821569A (en) 1937-12-08

Family

ID=9277521

Family Applications (1)

Application Number Title Priority Date Filing Date
FR821569D Expired FR821569A (en) 1936-08-14 1936-08-14 Public utility sound device

Country Status (1)

Country Link
FR (1) FR821569A (en)

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