Document Type and Number:
Japanese Patent JPS5246736
Kind Code:
Y2
Application Number:
JP9049973U
Publication Date:
October 24, 1977
Filing Date:
July 31, 1973
Export Citation:
International Classes:
G03B21/132; G02B3/08; G03B21/14; G03B21/20; (IPC1-7): G03B21/132; G03B21/20