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David A. Alven
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St. Marys, PA, US
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Patent Grant
Process for manufacturing hardened powder metal parts
Patent number
7,455,711
Issue date
Nov 25, 2008
Keystone Investment Corporation
John C. Kosco
C22 - METALLURGY FERROUS OR NON-FERROUS ALLOYS TREATMENT OF ALLOYS OR NON-FER...