Document Type and Number:
Japanese Patent JPS5318740
Kind Code:
Y2
More Like This:
Application Number:
JP2131074U
Publication Date:
May 19, 1978
Filing Date:
February 21, 1974
Export Citation:
International Classes:
G03B23/00; G03B21/00; G03B31/00; G03B31/06; (IPC1-7): G03B31/00; G03B23/00