| 摘要 |
The vibrator includes a selectively powered vibrating casing, on which an arch is mounted, the combination of the arch with the casing forming a closed loop. A resilient and flexible strap extends through the loop thus created, the strap being bored at its two end portions and being engaged by the two arms of the arcuate arch. The strap is slidable along the two arms of the arch, so that its position be adjustable relative to both the vibrating casing and the upper web of the arch itself.
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