| 摘要 |
A device for deterring birds, having rotatable structure rotatably mounted with respect to a mounting means, the rotatable structure having outwardly extending arms, each arm having a vane such that action of air flow on the vanes causes the rotatable structure to rotate wherein there are six said arms. 26, 8 ~2 8 30 3D 830 0 12.-- 34 |
