Document Type and Number:
Japanese Patent JPS56117726
Kind Code:
U
Application Number:
JP1680080U
Publication Date:
September 09, 1981
Filing Date:
February 12, 1980
Export Citation:
International Classes:
G03B13/36; G02B7/30; G03B3/00; (IPC1-7): G03B3/00; G02B7/11