FR681288A - Electromagnetic device for recording and reproducing acoustic oscillations - Google Patents
Electromagnetic device for recording and reproducing acoustic oscillationsInfo
- Publication number
- FR681288A FR681288A FR681288DA FR681288A FR 681288 A FR681288 A FR 681288A FR 681288D A FR681288D A FR 681288DA FR 681288 A FR681288 A FR 681288A
- Authority
- FR
- France
- Prior art keywords
- recording
- electromagnetic device
- acoustic oscillations
- reproducing acoustic
- reproducing
- 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
- G11B5/00—Recording by magnetisation or demagnetisation of a record carrier; Reproducing by magnetic means; Record carriers therefor
- G11B5/004—Recording on, or reproducing or erasing from, magnetic drums
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE141087X | 1928-09-26 |
Publications (1)
Publication Number | Publication Date |
---|---|
FR681288A true FR681288A (en) | 1930-05-13 |
Family
ID=5668510
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
FR681288D Expired FR681288A (en) | 1928-09-26 | 1929-09-04 | Electromagnetic device for recording and reproducing acoustic oscillations |
Country Status (5)
Country | Link |
---|---|
US (1) | US1846531A (en) |
AT (1) | AT125469B (en) |
CH (1) | CH141087A (en) |
DK (1) | DK44348C (en) |
FR (1) | FR681288A (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2672346A (en) * | 1946-12-21 | 1954-03-16 | Int Electronics Co | Office dictation and intercommunication system |
US2610257A (en) * | 1949-12-22 | 1952-09-09 | Warner Bros | Magnetic record volume control |
US2816174A (en) * | 1952-04-26 | 1957-12-10 | Rca Corp | Magnetic compression system |
-
1929
- 1929-04-12 US US354685A patent/US1846531A/en not_active Expired - Lifetime
- 1929-08-17 CH CH141087D patent/CH141087A/en unknown
- 1929-08-19 AT AT125469D patent/AT125469B/en active
- 1929-08-31 DK DK44348D patent/DK44348C/en active
- 1929-09-04 FR FR681288D patent/FR681288A/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
US1846531A (en) | 1932-02-23 |
AT125469B (en) | 1931-11-25 |
DK44348C (en) | 1931-07-13 |
CH141087A (en) | 1930-07-15 |
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