Document Type and Number:
Japanese Patent JPS567952
Kind Code:
Y2
Application Number:
JP3921276U
Publication Date:
February 21, 1981
Filing Date:
March 31, 1976
Export Citation:
International Classes:
G03B19/18; G03B17/38; G03B31/00; (IPC1-7): G03B31/00
Next Patent: JPH0567953