Card retrieval device
US4190899A · kind A · utility
9Cited by
1References
2Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 10, 1978 |
| Grant date | Feb 26, 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 retrieval device for use in an automatic microfilm display apparatus is provided with a switch for sensing that a film card has been retrieved. In the event the device fails to retrieve a film card, the absence of a switch output signal causes the control apparatus to repeat the card retrieval routine.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.