Document Type and Number:
Japanese Patent JPS51112540
Kind Code:
U
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Application Number:
JP3147475U
Publication Date:
September 11, 1976
Filing Date:
March 07, 1975
Export Citation:
International Classes:
G03B11/04; G03B31/00; H04R1/02; (IPC1-7): G03B11/04; G03B31/00; H04R1/02