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Technologies such as scanning laser systems and ultrasonic sensors have frequently been used in other applications, but were found unacceptable. However, a nearinfrared sensor employing active targets met the requirements. The sensor has a nominal 75 degree conical field of view and a .
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Coal mining Wikipedia. Coal mining is the process of extracting coal from the ground. Coal is valued for itsenergy content, and, since the 1880s, has been widely used to generate electricity. Know More
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Full text of "A glossary of terms used in coal mining"
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In the 1870s men were attracted away from Greenside by higher wages being paid in coal and iron mines. Average pay increased from 17 shillings to 21 shillings in 1873. The same problem saw the loss of a fifth of the men in 1899, in spite of a 10–15% pay rise the year before.
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The City of Cle Elum was founded in the early 1880's. The construction of the Northern Pacific Railroad and the discovery of coal led to rapid growth in the City of Cle Elum. Coal mining had a large presence in the area until the early 1960's when the last coal mines .
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