Document Type and Number:
Japanese Patent JPS5210331
Kind Code:
Y2
Application Number:
JP6277171U
Publication Date:
March 05, 1977
Filing Date:
July 19, 1971
Export Citation:
International Classes:
G03B23/00; G03B31/00; G03B31/06; (IPC1-7): G03B31/00; G03B23/00