Document Type and Number:
Japanese Patent JPS52163301
Kind Code:
U
Application Number:
JP7293676U
Publication Date:
December 10, 1977
Filing Date:
June 04, 1976
Export Citation:
International Classes:
G03B31/06; G03B21/00; G11B3/72; G11B23/44; (IPC1-7): G11B3/72; G03B21/00