Document Type and Number:
Japanese Patent JPS54166825
Kind Code:
U
Application Number:
JP6694178U
Publication Date:
November 24, 1979
Filing Date:
May 15, 1978
Export Citation:
International Classes:
G03B21/00; G03B21/08; G03B23/00; (IPC1-7): G03B21/08; G03B23/00