Document Type and Number:
Japanese Patent JPS4920846
Kind Code:
Y1
Application Number:
JP8217069U
Publication Date:
June 04, 1974
Filing Date:
December 27, 1969
Export Citation:
International Classes:
G03B27/32; G03B27/54; G03G15/00; G03G15/22; (IPC1-7): G03G15/00; G03B27/54