Document Type and Number:
Japanese Patent JPS5014121
Kind Code:
B1
Application Number:
JP7144469A
Publication Date:
May 26, 1975
Filing Date:
September 05, 1969
Export Citation:
International Classes:
G09B5/06; G03B21/00; G03B31/04; G03B31/06; (IPC1-7): G03B21/00; G03B31/04