FR669819A - Improvement in the electrical equipment of gramophones - Google Patents

Improvement in the electrical equipment of gramophones

Info

Publication number
FR669819A
FR669819A FR669819DA FR669819A FR 669819 A FR669819 A FR 669819A FR 669819D A FR669819D A FR 669819DA FR 669819 A FR669819 A FR 669819A
Authority
FR
France
Prior art keywords
gramophones
improvement
electrical equipment
electrical
equipment
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
Ugo Donarelli
Attilio Cillario
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 FR669819A publication Critical patent/FR669819A/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
FR669819D 1929-02-18 1929-02-18 Improvement in the electrical equipment of gramophones Expired FR669819A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR669819T 1929-02-18

Publications (1)

Publication Number Publication Date
FR669819A true FR669819A (en) 1929-11-21

Family

ID=9015931

Family Applications (1)

Application Number Title Priority Date Filing Date
FR669819D Expired FR669819A (en) 1929-02-18 1929-02-18 Improvement in the electrical equipment of gramophones

Country Status (1)

Country Link
FR (1) FR669819A (en)

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