Document Type and Number:
Japanese Patent JPS4878120
Kind Code:
U
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Application Number:
JP20427271U
Publication Date:
September 26, 1973
Filing Date:
December 27, 1971
Export Citation:
International Classes:
H04R17/10; G10K9/12; (IPC1-7): H04R17/10; G10K9/12; H01L41/10