Document Type and Number:
Japanese Patent JPS5590991
Kind Code:
U
Application Number:
JP17576478U
Publication Date:
June 23, 1980
Filing Date:
December 19, 1978
Export Citation:
International Classes:
H04R13/00; G04C21/02; H04R11/14; (IPC1-7): G04C21/02; H04R11/14