by adjustable or non-adjustable planing means with or without loading arrangements (by percussed planing means E21C27/46)

Full Title

Machines which completely free the mineral from the seam > Mineral freed by means not involving slitting > by adjustable or non-adjustable planing means with or without loading arrangements (by percussed planing means E21C27/46)

Child Classifications

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• E21C 27/34 Machine propelled along the working face by cable or chain
• E21C 27/36 Machine self-propelled along the working face
• E21C 27/38 Machine stationary while planing in an arc
• E21C 27/40 Machine and its planing tool making alternative step-wise movements along the working face
• E21C 27/42 combined with scraper or collector box
• E21C 27/44 Planing knives (mining picks E21C35/18)