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Andrew P. Dretzka
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Cudahy, WI, US
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last 30 patents
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Patent Grant
Bearing retainer assembly
Patent number
5,590,968
Issue date
Jan 7, 1997
Harnischfeger Corporation
Andrew P. Dretzka
E02 - HYDRAULIC ENGINEERING FOUNDATIONS SOIL SHIFTING
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Patent Grant
Assembly and method for tooth tip retention
Patent number
5,410,826
Issue date
May 2, 1995
Harnischfeger Corporation
Darryl R. Immel
E02 - HYDRAULIC ENGINEERING FOUNDATIONS SOIL SHIFTING
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Patent Grant
Bucket dump block
Patent number
5,398,433
Issue date
Mar 21, 1995
Harnischfeger Corporation
Andrew P. Dretzka
E02 - HYDRAULIC ENGINEERING FOUNDATIONS SOIL SHIFTING