FIELD: mining. SUBSTANCE: device for determination of coal strength is pressed to drill hole bottom. During drilling pin 13 with roller 14 rotates and simultaneously moves along slot 15. Device body 1 is immovable. When roller 14 contacts embedded member 17, it applies mark to control belt 18. Embedded member 17 presses button 22 of revolution counter 20. When control section is passed, number of revolutions is marked on control belt 18 in form of lines. Coal strength is determined by the intervals between lines. EFFECT: higher efficiency. 2 dwg
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