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Peter B. Dowden
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Kirkland, WA, US
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last 30 patents
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Patent Grant
Tunneling machine having liquid balance low flow slurry system
Patent number
5,203,614
Issue date
Apr 20, 1993
The Robbins Company
Richard J. Robbins
E21 - EARTH DRILLING MINING
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Patent Grant
Shaft boring machine and method
Patent number
4,646,853
Issue date
Mar 3, 1987
The Robbins Company
David B. Sugden
E21 - EARTH DRILLING MINING