Title:
【考案の名称】騒音制御型放送装置
Document Type and Number:
Japanese Patent JPH04105713
Kind Code:
U
Inventors:
Koichi Shimizu
Application Number:
JP1612391U
Publication Date:
September 11, 1992
Filing Date:
February 25, 1991
Export Citation:
International Classes:
H03G3/32; H04R27/00; (IPC1-7): H03G3/32; H04R27/00
Domestic Patent References:
| JPS6342210A | 1988-02-23 | |||
| JPS6064513A | 1985-04-13 | |||
| JPS5426284A | 1979-02-27 | |||
| JPS55127416U | 1980-09-09 | |||
| JPS55141842A | 1980-11-06 | |||
| JPS5411204A | 1979-01-27 |