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pioneer tunnel |
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pioneer tunnel [‚pī·ə′nir ‚tən·əl] (mining engineering) A small tunnel parallel to but ahead of a main tunnel and used to make crosscuts to the path that the main tunnel will follow. 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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