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Patent Searching and Data


Document Type and Number:
Japanese Patent JPS57134681
Kind Code:
U
Application Number:
JP2001881U
Publication Date:
August 21, 1982
Filing Date:
February 14, 1981
Export Citation:
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International Classes:
G04B11/02; G04B11/00; G04B23/02; G04B27/00; (IPC1-7): G04B11/00; G04B23/02