Description
Class E21D : SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
Subclass 5/02: Lining shafts; Linings therefor (E21D 11/00 takes precedence) with wood (E21D 5/01, E21D 5/012, E21D 5/016 take precedence)
E21D 5/02
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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Recent Publications
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Patents Issued To Date - By Filing Year
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