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Patent Searching and Data


Document Type and Number:
Japanese Patent JPS5291250
Kind Code:
U
Application Number:
JP17852775U
Publication Date:
July 07, 1977
Filing Date:
December 27, 1975
Export Citation:
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International Classes:
G09B9/02; G09B9/04; (IPC1-7): G09B9/04
Foreign References:
US3309163A1967-03-14