FR681288A - Electromagnetic device for recording and reproducing acoustic oscillations - Google Patents

Electromagnetic device for recording and reproducing acoustic oscillations

Info

Publication number: FR681288A
Authority: FR; France
Prior art keywords: recording; electromagnetic device; acoustic oscillations; reproducing acoustic; reproducing
Prior art date: 1928-09-26
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

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.)

TELEGRAPHIE PATENT SYNDIKAT

Original Assignee

TELEGRAPHIE PATENT SYNDIKAT

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.)

1928-09-26

Filing date

1929-09-04

Publication date

1930-05-13

1929-09-04 Application filed by TELEGRAPHIE PATENT SYNDIKAT filed Critical TELEGRAPHIE PATENT SYNDIKAT

1930-05-13 Application granted granted Critical

1930-05-13 Publication of FR681288A publication Critical patent/FR681288A/en

Status Expired legal-status Critical Current

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

FR681288D 1928-09-26 1929-09-04 Electromagnetic device for recording and reproducing acoustic oscillations Expired FR681288A (en)

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)

* Cited by examiner, † Cited by third party
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
AT125469B (en)	1931-11-25
CH141087A (en)	1930-07-15
DK44348C (en)	1931-07-13
US1846531A (en)	1932-02-23

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