Document Type and Number:
Japanese Patent JPS5211593
Kind Code:
B1
Application Number:
JP6986066A
Publication Date:
March 31, 1977
Filing Date:
October 24, 1966
Export Citation:
International Classes:
G03B13/36; G02B7/28; G02B7/36; G03B3/10; G03B21/53; (IPC1-7): G03B3/00; G03B13/18