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Patent Searching and Data

Document Type and Number:
Japanese Patent JPS4896938
Kind Code:
Application Number:
Publication Date:
November 17, 1973
Filing Date:
February 17, 1972
Export Citation:
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International Classes:
H04R1/02; A47B47/00; A47B47/04; A47B47/05; (IPC1-7): H04R1/02; A47B47/04

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