FR737429A - Improvements to sound recording devices - Google Patents
Improvements to sound recording devicesInfo
- Publication number
- FR737429A FR737429A FR737429DA FR737429A FR 737429 A FR737429 A FR 737429A FR 737429D A FR737429D A FR 737429DA FR 737429 A FR737429 A FR 737429A
- Authority
- FR
- France
- Prior art keywords
- recording devices
- sound recording
- sound
- devices
- recording
- 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
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
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US539899A US1999700A (en) | 1931-05-25 | 1931-05-25 | Sound recording apparatus |
Publications (1)
Publication Number | Publication Date |
---|---|
FR737429A true FR737429A (en) | 1932-12-12 |
Family
ID=24153121
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR737429D Expired FR737429A (en) | 1931-05-25 | 1932-05-23 | Improvements to sound recording devices |
Country Status (2)
Country | Link |
---|---|
US (1) | US1999700A (en) |
FR (1) | FR737429A (en) |
-
1931
- 1931-05-25 US US539899A patent/US1999700A/en not_active Expired - Lifetime
-
1932
- 1932-05-23 FR FR737429D patent/FR737429A/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
US1999700A (en) | 1935-04-30 |
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