Document Type and Number:
Japanese Patent JPS56117725
Kind Code:
U
Application Number:
JP1469080U
Publication Date:
September 09, 1981
Filing Date:
February 08, 1980
Export Citation:
International Classes:
G03B13/36; G02B7/28; G03B3/00; G03B17/20; (IPC1-7): G03B3/00; G02B7/11; G03B17/20
Domestic Patent References:
| JPS5249027A | 1977-04-19 | |||
| JPS5418730A | 1979-02-13 | |||
| JPS483925A |