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spiral ramp system |
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spiral ramp system [′spī·rəl ′ramp ‚sis·təm] (mining engineering) Development of a mine by driving moderately inclined haulageways from the surface to underground ore horizons. 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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