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Inventor
COKUS MIKE
US
2 patents
Patents
2 patents
US4969778A
Nov 13, 1990
Expansion assembly for mine roof bolts utilized in small diameter bore holes
JENNMAR CORP
19 citations
71
US4904123A
Feb 27, 1990
Expansion assembly for mine roof bolts utilized in small diameter bore holes
JENNMAR CORP
19 citations
71