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Vacuum pumping system
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Patent number 7,094,036
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Issue date Aug 22, 2006
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The BOC Group plc
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Darren Mennie
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F04 - POSITIVE DISPLACEMENT MACHINES FOR LIQUIDS PUMPS FOR LIQUIDS OR ELASTIC...
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Freezing a gas component in a gas mixture
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Patent number 6,343,488
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Issue date Feb 5, 2002
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Forschungszentrum Julich GmbH
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Helmut Hackfort
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F25 - REFRIGERATION OR COOLING COMBINED HEATING AND REFRIGERATION SYSTEMS HEA...
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Device for liquefying gases
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Patent number 4,055,961
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Issue date Nov 1, 1977
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U.S. Philips Corporation
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Petrus Simon Admiraal
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F25 - REFRIGERATION OR COOLING COMBINED HEATING AND REFRIGERATION SYSTEMS HEA...
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3854913
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Patent number 3,854,913
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Issue date Dec 17, 1974
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F25 - REFRIGERATION OR COOLING COMBINED HEATING AND REFRIGERATION SYSTEMS HEA...
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3543529
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Patent number 3,543,529
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Issue date Dec 1, 1970
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F25 - REFRIGERATION OR COOLING COMBINED HEATING AND REFRIGERATION SYSTEMS HEA...
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3501923
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Patent number 3,501,923
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Issue date Mar 24, 1970
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F25 - REFRIGERATION OR COOLING COMBINED HEATING AND REFRIGERATION SYSTEMS HEA...