Document Type and Number:
Japanese Patent JPS5642647
Kind Code:
Y2
Application Number:
JP8822276U
Publication Date:
October 06, 1981
Filing Date:
July 05, 1976
Export Citation:
International Classes:
G03B13/36; G02B7/30; G02B27/10; G03B3/00; (IPC1-7): G02B7/11