Document Type and Number:
Japanese Patent JPS5669726
Kind Code:
U
Application Number:
JP15280579U
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 |