Patent classifications
E
FIXED CONSTRUCTIONS
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E21
EARTH OR ROCK DRILLING; MINING
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E21D
SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
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9/00
Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
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E21D9/10
Making by using boring or cutting machines
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E21D9/1006
with rotary cutting tools
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E21D9/1013
on a tool-carrier supported by a movable boom
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E21D9/102
by a longitudinally extending boom being pivotable about a vertical and a transverse axis
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E21D9/1026
the tool-carrier being rotated about a transverse axis
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