IP Library › Granted Patent US 4,122,681
Granted Patent Utility
US 4,122,681 · App. 05/833,867

Mine roof support assembly

Inventors: George S. Vass, Gerald M. Speidel
Patented Case View Patent ↗
Granted: Oct 31, 1978 Filed: Sep 16, 1977
Inventors
George S. Vass
Gerald M. Speidel
Assignee (at issue)
The Eastern Company

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Quick Facts
Patent No.
US 4,122,681
App. No.
05/833,867
Filed
1977-09-16
Granted
1978-10-31
Kind
A