Document Type and Number:
Japanese Patent JPS5237222
Kind Code:
Y2
Application Number:
JP13391972U
Publication Date:
August 24, 1977
Filing Date:
November 22, 1972
Export Citation:
International Classes:
G03B21/00; G03B21/10; G03B23/02; G03B31/00; G03B31/06; (IPC1-7): G03B21/00