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Patent Searching and Data


Document Type and Number:
Japanese Patent JPS5221547
Kind Code:
U
Application Number:
JP10643075U
Publication Date:
February 16, 1977
Filing Date:
July 31, 1975
Export Citation:
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International Classes:
G09B23/04; G09B19/00; G09B27/02; (IPC1-7): G09B27/02; G09B19/00
Domestic Patent References:
JPS45889Y11970-01-16
JPS4949927U1974-05-01