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prop-free front |
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prop-free front [′präp ‚frē ‚frənt] (mining engineering) In coal mining, longwall working in which support to the roof is given by roof beams cantilevered from behind the working face. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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