Document Type and Number:
Japanese Patent JPS53164148
Kind Code:
U
Application Number:
JP7049177U
Publication Date:
December 22, 1978
Filing Date:
May 30, 1977
Export Citation:
International Classes:
G03B13/36; G02B7/28; G03B3/00; G03B17/20; (IPC1-7): G02B7/11; G03B3/00; G03B17/20