Document Type and Number:
Japanese Patent JPS5423305
Kind Code:
Y2
Application Number:
JP1905773U
Publication Date:
August 10, 1979
Filing Date:
February 13, 1973
Export Citation:
International Classes:
G03B9/02; G03B17/12; G03B17/14; G03B17/56; G03B19/02; (IPC1-7): G03B17/14