Magnetic drum cassette with magnetic drum having voice information recorded thereon
US4609956A · kind A · utility
3Cited by
8References
5Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 29, 1983 |
| Grant date | Sep 2, 1986 |
| Priority date | — |
| Expiry date | Aug 29, 2003 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B23/50
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A magnetic drum and parts ancillary thereto are enclosed in a housing consisting of an upper casing and a lower casing to form a cassette-type magnetic drum unit for voice information system. The magnetic drum cassette is releasable from the system which includes a magnetic head for reproducing the voice information stored in the magnetic drum.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.