| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a device for preventing a pigeon from coming flying, using the magnetic field of magnets. <P>SOLUTION: A pair of permanent magnets is stood by a support in a site where a pigeon comes flying so that different magnetic poles are opposed each other and a fixed width of a magnetic field is formed between the magnetic poles. <P>COPYRIGHT: (C)2012,JPO&INPIT |
