Document Type and Number:
Japanese Patent JPS52141941
Kind Code:
U
Application Number:
JP5053476U
Publication Date:
October 27, 1977
Filing Date:
April 21, 1976
Export Citation:
International Classes:
G03B19/18; G03B17/00; G03B23/02; (IPC1-7): G03B17/00; G03B23/02
Domestic Patent References:
| JP50058743B | ||||
| JPS45346Y1 | 1970-01-09 |