David Irwin Ellingson

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Newton, IA, US

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Patents Grantslast 30 patents

Information Patent Grant
Cable traction apparatus and method
- Patent number 7,021,510
- Issue date Apr 4, 2006
- David Irwin Ellingson
- B61 - RAILWAYS

Patents Applicationslast 30 patents

Information Patent Application
Cable traction apparatus and method
- Publication number 20050179019
- Publication date Aug 18, 2005
- David Irwin Ellingson
- B61 - RAILWAYS