Document Type and Number:
Japanese Patent JPS5616588
Kind Code:
Y2
Application Number:
JP3886474U
Publication Date:
April 17, 1981
Filing Date:
April 05, 1974
Export Citation:
International Classes:
G03B19/18; G03B21/00; G03B21/34; G03B21/36; G03B23/18; (IPC1-7): G03B23/16; G03B21/36