Document Type and Number:
Japanese Patent JPS5616074
Kind Code:
U
Application Number:
JP9762080U
Publication Date:
February 12, 1981
Filing Date:
July 11, 1980
Export Citation:
International Classes:
G04B37/06; G04B37/10; G04C3/00; G04G21/00; G04G99/00; (IPC1-7): G04B37/06; G04C3/00
Domestic Patent References:
| JPS5122456B1 | 1976-07-09 | |||
| JPS4943563U | 1974-04-17 |