| 摘要 |
<p>An impact pad comprising an upper part, a middle part, and a lower part, the said upper part being configured as a single piece with a plurality of protrusions on a under side there of facing the middle part, such that said protrusions are adapted to fit in the grooves provided on the top surface of the middle part, the bottom surface of the middle part being provided with the third part, namely means for fastening impact pads on the main support frame with clamps.</p> |
