Document Type and Number:
Japanese Patent JPS5496639
Kind Code:
U
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Application Number:
JP17172677U
Publication Date:
July 07, 1979
Filing Date:
December 20, 1977
Export Citation:
International Classes:
G03B21/00; G03B23/00; G03B31/06; (IPC1-7): G03B31/06; G03B21/00; G03B23/00