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Patent Searching and Data


Document Type and Number:
Japanese Patent JPS5217734
Kind Code:
B1
Application Number:
JP1207771A
Publication Date:
May 17, 1977
Filing Date:
March 06, 1971
Export Citation:
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International Classes:
G03B31/02; G11B15/02; (IPC1-7): G03B31/02; G11B15/02