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sand box |
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sand jack A box having tight joints which is filled with dry, clean sand on which rests a tight-fitting plunger; the plunger supports the bottom of posts used in centering; when it is desired to lower the centering, a plug in the bottom of the box is removed, allowing the sand to run out. Want to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit the webmaster's page for free fun content. |
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