Card selector device
US4223212A · kind A · utility
2Cited by
3References
2Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 10, 1978 |
| Grant date | Sep 16, 1980 |
| Priority date | — |
| Expiry date | Apr 10, 1998 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N2201/04758
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A film card selection device for use in an automatic microfilm display apparatus is provided with a switch for sensing that a film card has been selected. A counter counts the number of drive gear teeth passing a selected point after selection of a film card so that the apparatus can be stopped with the selected card in position for retrieval.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.