Method and apparatus for tabulating the contents on a record medium by use of time
US3959814A · kind A · utility
2Cited by
9References
3Claims
0Family size
Inventor
Key dates
| Filing date | Jul 31, 1974 |
| Grant date | May 25, 1976 |
| Priority date | — |
| Expiry date | Jul 31, 1994 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG11B27/032
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A tape recorder, a clock and a plurality of switches which can be arranged so that the clock and tape recorder can be energized independently of each other or in unision so that the clocck will serve as an elapsed time indicator.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.