David A. Monaghan

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Newton Center, MA, US

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Patents Grantslast 30 patents

Information Patent Grant
Extensible brattice and cantilevered roof mounted support system th...
- Patent number 4,180,352
- Issue date Dec 25, 1979
- The United States of America as represented by the Secretary of the Interior
- Edward F. Divers
- E21 - EARTH DRILLING MINING
Information Patent Grant
Acoustic method and apparatus for determining effectiveness of mine...
- Patent number 3,934,219
- Issue date Jan 20, 1976
- The United States of America as represented by the Secretary of the Interior
- David A. Monaghan
- E21 - EARTH DRILLING MINING