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In the old days, a canary went down to work with coal miners. ... Why did they put canaries in coal mines? Esther InglisArkell. 1/23/14 4:50pm. Filed to: biology.
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The history of coal mining goes back thousands of years. It became important in the Industrial Revolution of the 19th and 20th centuries, when it was primarily used ...
A safety lamp is any of several types of lamp that provides illumination in coal mines and is designed to operate in air that may contain coal dust or gases both of ...
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intelligent helmet for coal mines based on ZigBee wireless communication, their main idea is to detect the ... The person who is monitoring in the ground
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Glossary of Mining Terms ... Cap A miner''s safety helmet. ... under, or above the surface of such land by any person, used in extracting coal from its natural ...
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