Document Type and Number:
Japanese Patent JPS53157732
Kind Code:
U
Application Number:
JP6263877U
Publication Date:
December 11, 1978
Filing Date:
May 18, 1977
Export Citation:
International Classes:
G03B13/36; G02B7/28; G03B3/00; (IPC1-7): G02B7/11; G03B3/00