Document Type and Number:
Japanese Patent JPS54176335
Kind Code:
U
Application Number:
JP7541678U
Publication Date:
December 13, 1979
Filing Date:
June 01, 1978
Export Citation:
International Classes:
G03B21/64; G03B21/00; G03B21/11; (IPC1-7): G03B21/11; G03B21/64