Document Type and Number:
Japanese Patent JPS4899727
Kind Code:
U
Application Number:
JP2251172U
Publication Date:
November 24, 1973
Filing Date:
February 23, 1972
Export Citation:
International Classes:
G03B7/099; G03B7/0997; G03B19/18; (IPC1-7): G03B19/18; G03B7/08