Douglas F. Winberg

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Issaquah, WA, US

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Patents Grantslast 30 patents

Information Patent Grant
Tunneling shield
- Patent number 3,979,921
- Issue date Sep 14, 1976
- Dresser Industries, Inc.
- Douglas F. Winberg
- E21 - EARTH DRILLING MINING
Information Patent Grant
Tunnel boring machine with dual support members
- Patent number 3,957,310
- Issue date May 18, 1976
- Douglas F. Winberg
- E21 - EARTH DRILLING MINING