Document Type and Number:
Japanese Patent JPS5669727
Kind Code:
U
Application Number:
JP15280679U
Publication Date:
June 09, 1981
Filing Date:
November 02, 1979
Export Citation:
International Classes:
G03B21/00; G03B23/00; G03B23/02; (IPC1-7): G03B21/00; G03B23/02
Domestic Patent References:
JPS3215539Y1 | ||||
JPS4515512Y1 | 1970-06-29 |