Document Type and Number:
Japanese Patent JPS56117722
Kind Code:
U
Application Number:
JP18198880U
Publication Date:
September 09, 1981
Filing Date:
December 18, 1980
Export Citation:
International Classes:
G02B6/12; G02F1/11; G02F1/335; (IPC1-7): G02F1/11; G02B5/174