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Patent Searching and Data


Document Type and Number:
Japanese Patent JPH02138997
Kind Code:
U
Application Number:
JP4909989U
Publication Date:
November 20, 1990
Filing Date:
April 25, 1989
Export Citation:
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International Classes:
H04R3/02; (IPC1-7): H04R3/02
Domestic Patent References:
JPS622499A1987-01-08
JPS62231597A1987-10-12



 
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