Document Type and Number:
Japanese Patent JPS5535551
Kind Code:
U
Application Number:
JP11844578U
Publication Date:
March 07, 1980
Filing Date:
August 31, 1978
Export Citation:
International Classes:
G03B7/095; G03B9/02; G03B9/07; (IPC1-7): G03B7/095; G03B9/02
Domestic Patent References:
| JPS5075031A | 1975-06-20 | |||
| JPS4914177A | 1974-02-07 |