Document Type and Number:
Japanese Patent JPS55172892
Kind Code:
U
Application Number:
JP7222179U
Publication Date:
December 11, 1980
Filing Date:
May 29, 1979
Export Citation:
International Classes:
G10K9/22; G04C21/02; G10K9/12; G10K9/13; H04R11/00; H04R13/00; (IPC1-7): G04C21/02; G10K9/12; H04R11/00