Roger T. Hoffman

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Monroe Center, IL, US

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Patents Grantslast 30 patents

Information Patent Grant
Orbital rubbing machine with improved spindle locking member
- Patent number 4,924,636
- Issue date May 15, 1990
- National-Detroit, Inc.
- Roger T. Hoffman
- B24 - GRINDING POLISHING
Information Patent Grant
Straight-line rubbing machine with thrust transmitting members
- Patent number 4,686,797
- Issue date Aug 18, 1987
- National Air Sander, Inc.
- Roger T. Hoffman
- B24 - GRINDING POLISHING