Document Type and Number:
Japanese Patent JPS5222273
Kind Code:
Y2
Application Number:
JP3066774U
Publication Date:
May 21, 1977
Filing Date:
March 15, 1974
Export Citation:
International Classes:
E04D13/00; F24S23/70; G02B5/08; G02B17/00; G02B17/06; (IPC1-7): G02B17/00; E04D13/00; F24J3/02