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double headings |
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double headings [¦dəb·əl ′hed·iŋz] (mining engineering) A pair of coal headings driven parallel to each other and positioned side by side about 10-20 yards (9-18 meters) apart. 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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