| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a bird damage-preventing device, preventing birds from perching by rotating instantly when the birds perch, preventing damages caused by excrements and building nests, also preventing the piling of snow when the snow falls and eliminating a danger caused by the falling down of frozen ice. <P>SOLUTION: This bird damage-preventing device is constituted with a bearing tube 2 fitted to an electric cable 1 and an outer tube 3 fitted to the outside of the bearing tube as freely rotatable, and having at least 1 line of a spiral projection 4 installed by projecting spirally at the outer circumference of the outer tube from its one end to another end. <P>COPYRIGHT: (C)2006,JPO&NCIPI</p> |
