David M. Barbera

Follow

Person

Bolivar, OH, US

People

Patents Grantslast 30 patents

Information Patent Grant
Collapsible rock head
- Patent number 7,367,412
- Issue date May 6, 2008
- Anthony R. Barbera
- E21 - EARTH DRILLING MINING

Patents Applicationslast 30 patents

Information Patent Application
Collapsible rock head
- Publication number 20070251730
- Publication date Nov 1, 2007
- Anthony R. Barbera
- E21 - EARTH DRILLING MINING