Document Type and Number:
Japanese Patent JPS5570888
Kind Code:
U
Application Number:
JP15449878U
Publication Date:
May 15, 1980
Filing Date:
November 09, 1978
Export Citation:
International Classes:
H04R27/00; A47G33/02; H04B11/00; (IPC1-7): A47G33/02; H04B11/00
Domestic Patent References:
| JPS4016444Y1 | ||||
| JPS408785Y1 |