| http://www.w3.org/ns/prov#value | - Although the clamping means 406 is shown in FIG. 4 as positioned near an outer edge or the holder 410, it is understood that the clamping means 406 can be configured and/or positioned in such a manner as to distribute pressure around the outer faces and along a length of the holder 410 to optimize a seal between the holder 410 and the block of material 420.
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