The apparatus 3, wherein {HEAD ~ each} of {TAIL ~ the buffering members} comprises a substrate contact portion contacting the substrate, and an impact absorbing portion coupled to a lower portion of the substrate contact portion to absorb impact applied to the substrate contact portion 
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The apparatus 3 , wherein { HEAD ~ each } of { TAIL ~ the buffering members } comprises a substrate contact portion contacting the substrate , and an impact absorbing portion coupled to a lower portion of the substrate contact portion to absorb impact applied to the substrate contact portion
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