FR728944A - Improvements to sound recording and reproduction systems - Google Patents

Improvements to sound recording and reproduction systems

Info

Publication number
FR728944A
FR728944A FR728944DA FR728944A FR 728944 A FR728944 A FR 728944A FR 728944D A FR728944D A FR 728944DA FR 728944 A FR728944 A FR 728944A
Authority
FR
France
Prior art keywords
sound recording
reproduction systems
reproduction
systems
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)
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 FR728944A publication Critical patent/FR728944A/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
    • G11B3/00—Recording by mechanical cutting, deforming or pressing, e.g. of grooves or pits; Reproducing by mechanical sensing; Record carriers therefor
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B3/00—Recording by mechanical cutting, deforming or pressing, e.g. of grooves or pits; Reproducing by mechanical sensing; Record carriers therefor
    • G11B3/68—Record carriers
    • G11B3/72—Groove formations, e.g. run-in groove, run-out groove
FR728944D 1931-04-18 1931-12-30 Improvements to sound recording and reproduction systems Expired FR728944A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US728944XA 1931-04-18 1931-04-18

Publications (1)

Publication Number Publication Date
FR728944A true FR728944A (en) 1932-07-13

Family

ID=22110387

Family Applications (1)

Application Number Title Priority Date Filing Date
FR728944D Expired FR728944A (en) 1931-04-18 1931-12-30 Improvements to sound recording and reproduction systems

Country Status (1)

Country Link
FR (1) FR728944A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE757878C (en) * 1939-12-22 1954-02-01 Telefunkenplatte G M B H Record with side writing

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE757878C (en) * 1939-12-22 1954-02-01 Telefunkenplatte G M B H Record with side writing

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