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hydraulic or pneumatic
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CPC
E21D15/545
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E
FIXED CONSTRUCTIONS
E21
Mining
E21D
SHAFTS TUNNELS GALLERIES LARGE UNDERGROUND CHAMBERS
E21D15/00
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E21D15/545
hydraulic or pneumatic
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Patents Grants
last 30 patents
Information
Patent Grant
3184206
Patent number
3,184,206
Issue date
May 18, 1965
E21 - EARTH DRILLING MINING
Patents Applications
last 30 patents
Information
Patent Application
TEMPORARY ROOF SUPPORT SYSTEM WITH ANTI-ROTATION FEATURE
Publication number
20160102552
Publication date
Apr 14, 2016
Caterpillar Global Mining America LLC
David M. Denson
E21 - EARTH DRILLING MINING