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Compact gas compressor check valve
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Patent number 4,601,305
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Issue date Jul 22, 1986
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Robert A. Nordskog
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F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
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Dump valve assembly
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Patent number 4,209,163
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Issue date Jun 24, 1980
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Robert A. Nordskog
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F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
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Brake and tie-down mechanism
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Patent number 4,073,369
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Issue date Feb 14, 1978
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Nordskog Company Inc.
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Robert A. Nordskog
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B60 - VEHICLES IN GENERAL
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Trolley cart braking system
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Patent number 3,987,871
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Issue date Oct 26, 1976
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Nordskog Company Inc.
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Robert A. Nordskog
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B62 - LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS