Lester J. Sterwerf Jr.

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Harrison, OH, US

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Patents Grantslast 30 patents

Information Patent Grant
Wedging arrangement for attaching a bit holder to the base member o...
- Patent number 5,370,448
- Issue date Dec 6, 1994
- Cincinnati Mine Machinery Company
- Lester J. Sterwerf
- E21 - EARTH DRILLING MINING
Information Patent Grant
Endless chains comprised of interdigitated link elements having a Y...
- Patent number 4,717,206
- Issue date Jan 5, 1988
- The Cincinnati Mine Machinery Company
- Lester J. Sterwerf
- E21 - EARTH DRILLING MINING
Information Patent Grant
Endless chains comprised of interdigitated link elements having an...
- Patent number 4,674,803
- Issue date Jun 23, 1987
- The Cincinnati Mine Machinery Company
- Lester J. Sterwerf
- E21 - EARTH DRILLING MINING
Information Patent Grant
Combined base member and bit holder with protected retainer
- Patent number 4,632,463
- Issue date Dec 30, 1986
- The Cincinnati Mine Machinery Company
- Lester J. Sterwerf
- E21 - EARTH DRILLING MINING