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Piston blank for a forged piston
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Patent number 4,910,093
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Issue date Mar 20, 1990
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Berchem & Schaberg GmbH
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Rutger Berchem
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B21 - MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL PUNCHING...
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Rotating cutter head
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Patent number 4,711,504
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Issue date Dec 8, 1987
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Berchem & Schaberg GmbH
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Rutger Berchem
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E02 - HYDRAULIC ENGINEERING FOUNDATIONS SOIL SHIFTING
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Excavator tooth
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Patent number 4,676,014
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Issue date Jun 30, 1987
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Berchem & Schaberg GmbH
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Rutger Berchem
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E02 - HYDRAULIC ENGINEERING FOUNDATIONS SOIL SHIFTING
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Method of making a piston bottom
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Patent number 4,532,686
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Issue date Aug 6, 1985
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Berchem & Schaberg GmbH
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Rutger Berchem
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B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR
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Rotary stone-cutting head
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Patent number 4,461,513
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Issue date Jul 24, 1984
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Berchem & Schaberg GmbH
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Rutger Berchem
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E02 - HYDRAULIC ENGINEERING FOUNDATIONS SOIL SHIFTING