Document Type and Number:
Japanese Patent JPS5280646
Kind Code:
U
Application Number:
JP16854375U
Publication Date:
June 16, 1977
Filing Date:
December 12, 1975
Export Citation:
International Classes:
G03B17/12; G02B15/10; G03B11/00; (IPC1-7): G02B15/10; G03B11/00
Domestic Patent References:
| JPS472116U | 1972-08-24 | |||
| JP39017726A | ||||
| JP49080735B |