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Edward J. Ratkay
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Canfield, OH, US
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last 30 patents
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Patent Grant
Rotary impeller or motor with pressure balanced end plates
Patent number
4,292,013
Issue date
Sep 29, 1981
Commercial Shearing, Inc.
Carl M. Singer
F04 - POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS PUMPS FOR LIQUIDS OR ELASTIC...