Ralph E. Coffman

Follow

Person

Bucyrus, OH, US

People

Patents Grantslast 30 patents

Information Patent Grant
Dragline bucket line protection device
- Patent number 5,140,761
- Issue date Aug 25, 1992
- Dresser Industries, Inc.
- Ralph E. Coffman
- E02 - HYDRAULIC ENGINEERING FOUNDATIONS SOIL SHIFTING