Document Type and Number:
Japanese Patent JPS56501775
Kind Code:
A
Application Number:
JP50094480A
Publication Date:
December 03, 1981
Filing Date:
December 17, 1979
Export Citation:
International Classes:
G02C1/02; G02C3/00; G02C5/14; (IPC1-7): G02C3/00; G02C5/14