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Machine and its planing tool making alternative step-wise movements along the working face
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Industry
CPC
E21C27/40
This industry / category may be too specific. Please go to a parent level for more data
Parent Industries
E
FIXED CONSTRUCTIONS
E21
Mining
E21C
MINING OR QUARRYING
E21C27/00
Machines which completely free the mineral from the seam
Current Industry
E21C27/40
Machine and its planing tool making alternative step-wise movements along the working face
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Patents Grants
last 30 patents
Information
Patent Grant
3216510
Patent number
3,216,510
Issue date
Nov 9, 1965
E21 - EARTH DRILLING MINING
Patents Applications
last 30 patents
CPC
E21C27/40
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