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Patent Searching and Data


Document Type and Number:
Japanese Patent JPS4811309
Kind Code:
Y1
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Application Number:
JP3305669U
Publication Date:
March 27, 1973
Filing Date:
April 11, 1969
Export Citation:
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International Classes:
G02B23/02; G02B7/18; G02B7/182; G02B23/16; (IPC1-7): G02B23/16; G02B7/18



 
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