Inventor
JOHNSEN DAVID SEAN
US4 patents
Patents
4 patentsUS6863717B2Mar 8, 2005
Plate handling system and a method of removing plates from rail ties
NORDCO INC22 citations90
US6755135B2Jun 29, 2004
Combined tie extractor and plate remover for rail maintenance
NORDCO INC7 citations71
US6622633B1Sep 23, 2003
Railroad machine centering system
NORDCO INC9 citations71
US6832558B2Dec 21, 2004
Riding rail tie plugging apparatus
NORDCO INC7 citations69