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Rotary power trowel
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Patent number 4,232,980
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Issue date Nov 11, 1980
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Stone Construction Equipment, Inc.
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Christian T. Tertinek
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E04 - BUILDING
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Plate type compactor
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Patent number 4,113,403
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Issue date Sep 12, 1978
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Stone Construction Equipment Inc.
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Christian T. Tertinek
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E02 - HYDRAULIC ENGINEERING FOUNDATIONS SOIL SHIFTING
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Paddle shaft seal assembly
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Patent number 3,932,006
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Issue date Jan 13, 1976
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Christian T. Tertinek
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F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...