Document Type and Number:
Japanese Patent JPS5219560
Kind Code:
Y2
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Application Number:
JP2567571U
Publication Date:
May 06, 1977
Filing Date:
April 06, 1971
Export Citation:
International Classes:
G03B31/04; G03B31/00; G11B31/00; (IPC1-7): G03B31/04; G11B31/00