FR740578A - Improvements to electrical sound recording devices - Google Patents

Improvements to electrical sound recording devices

Info

Publication number
FR740578A
FR740578A FR740578DA FR740578A FR 740578 A FR740578 A FR 740578A FR 740578D A FR740578D A FR 740578DA FR 740578 A FR740578 A FR 740578A
Authority
FR
France
Prior art keywords
recording devices
sound recording
electrical sound
electrical
devices
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.)
RCA Corp
Original Assignee
RCA Corp
Radio Corporation of America
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 RCA Corp, Radio Corporation of America filed Critical RCA Corp
Application granted granted Critical
Publication of FR740578A publication Critical patent/FR740578A/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
FR740578D 1931-08-06 1932-07-29 Improvements to electrical sound recording devices Expired FR740578A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US740578XA 1931-08-06 1931-08-06

Publications (1)

Publication Number Publication Date
FR740578A true FR740578A (en) 1933-01-27

Family

ID=22117438

Family Applications (1)

Application Number Title Priority Date Filing Date
FR740578D Expired FR740578A (en) 1931-08-06 1932-07-29 Improvements to electrical sound recording devices

Country Status (1)

Country Link
FR (1) FR740578A (en)

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