Combined with scraper or collector box (E21C27/42)

E   Fixed constructions(159044)
E21C     ining or quarrying(17294)
E21C27/42                     Combined with scraper or collector box(75)

Scaperotta installation for the extraction of coal seam flat and inclined bedding // 2176733
The invention relates to mining, and specifically to means of extraction of coal with a scraper shipping it from stope
 
2551046.
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