![](http://www.alamy.com/thumbs/6/5A50DDB8-785B-4B30-96F5-CEFB7CA2F737/PHM659.jpg)
Image from page 431 of 'A Comprehensive Reference Book on Practical Coal Mining ... Fourth edition' .
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Photo credit: © Abu Castor / Alamy / Afripics
License: Licensed
Model Released: No
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