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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E21D9/06
Making by using a driving shield; , i.e. advanced by pushing means bearing against the already placed lining
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E21D9/08
with additional boring or cutting means; other than the conventional cutting edge of the shield
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E21D9/087
with a rotary drilling-head cutting simultaneously the whole cross-section, i.e. full-face machines
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