| 摘要 |
PROBLEM TO BE SOLVED: To surely prevent damages by birds and animals for a long period of time. SOLUTION: The approach of harmful birds and animals to a zone to be repulsed or the entry of the harmful birds and animals into the zone to be repulsed is detected by a bird and animal detecting means 10 and irritation means 16 and 17 are controlled by control means 12 and 15 to intermittently and repeatedly generate an irritation to make harmful birds and animals watch and repel the irritation.
|
