Document Type and Number:
Japanese Patent JPS4727939
Kind Code:
U
Application Number:
JP2983271U
Publication Date:
November 29, 1972
Filing Date:
April 18, 1971
Export Citation:
International Classes:
G03B7/12; G03B7/20; G03B9/02; (IPC1-7): G03B9/02; G03B7/08; G03B7/20