| 摘要 |
<p>The device is divide at least into halves (1,5) that can be joined along a dividing plane and reversibly connected by an attachment arrangement (9). The facing peripheral edges of the halves have complementary teeth (3,7) extending essentially perpendicular to the dividing plane and protruding beyond the plane. The teeth have outward protrusions (4,8) at their free ends that have a gap between them when the teeth are engaged for insertion of an elastic ring (9) enclosing the housing and preventing separation of the helves.</p> |
