Document Type and Number:
Japanese Patent JPS4722918
Kind Code:
U
Application Number:
JP2068471U
Publication Date:
November 15, 1972
Filing Date:
March 25, 1971
Export Citation:
International Classes:
H04R1/02; H04R1/22; H04R1/28; (IPC1-7): H04R1/02; H04R1/28