Description
Class E21D : SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
Subclass 1/16: Sinking shafts Preparation of the ground by petrification (grouting anchoring-bolts E21D 20/02)
E21D 1/16
Sub-Class
Stats
- 0 US PATENTS IN FORCE
- 0 US APPLICATIONS PENDING
- 0 Total Patent Owners
- 0 TOTAL INVENTORS
Recent Patents
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Patents Issued To Date - By Filing Year
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