Mobile visual signalling device
US4176483A · kind A · utility
9Cited by
4References
10Claims
0Family size
Inventor
Key dates
| Filing date | Nov 18, 1977 |
| Grant date | Dec 4, 1979 |
| Priority date | — |
| Expiry date | Nov 18, 1997 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09F2011/0018
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The proposed invention is directed to an electrically driven and electrically controlled film viewing device including a viewing screen and a film transport means including a double reel assembly and further including means to drive the reels and also incorporating electrical control means for the drive means so as to selectively position the film with respect to the viewing screen.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.