Document Type and Number:
Japanese Patent JPS5250796
Kind Code:
Y1
Application Number:
JP4807770U
Publication Date:
November 17, 1977
Filing Date:
May 18, 1970
Export Citation:
International Classes:
G03B23/10; G03B21/10; G03B23/00; (IPC1-7): G03B21/10; G03B23/00