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Patent Searching and Data


Document Type and Number:
Japanese Patent JPS639040
Kind Code:
Y2
Application Number:
JP19105380U
Publication Date:
March 17, 1988
Filing Date:
December 29, 1980
Export Citation:
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International Classes:
G08B19/00; G08B23/00; G08B25/00; H04J3/00; H04L5/22; H04Q9/00; (IPC1-7): G08B23/00