Document Type and Number:
Japanese Patent JPS5245997
Kind Code:
U
Application Number:
JP13191975U
Publication Date:
March 31, 1977
Filing Date:
September 29, 1975
Export Citation:
International Classes:
G02C3/00; A63B33/00; G02C5/16; (IPC1-7): A63B33/00; G02C5/16