| 摘要 |
A pair of barrel-shaped bodies are provided with each body constructed of resilient material and including a plurality of peripherally spaced and alternately oppositely axially end opening generally U-shaped body segments incorporating generally parallel legs interconnected at one pair of corresponding ends by an integral bight portion extending therebetween. The legs of peripherally adjacent and oppositely axially opening U-shaped body segments are at least substantially coextensive and are integrally formed.
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