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Connection of carbon or graphite tubes
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Patent number 4,921,283
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Issue date May 1, 1990
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Sigri GmbH
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Kurt Schaffner
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F16 - ENGINEERING ELEMENTS AND UNITS GENERAL MEASURES FOR PRODUCING AND MAINT...
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Tube bundle heat exchanger
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Patent number 4,474,233
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Issue date Oct 2, 1984
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Sigri Elektrographit GmbH
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Adolf Swozil
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F28 - HEAT EXCHANGE IN GENERAL
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Vacuum support for burst protection device
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Patent number 4,315,575
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Issue date Feb 16, 1982
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Sigri Elektrographit Gesellschaft mit Beschrankter Haftung
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Erwin Schwarz
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B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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Column seal
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Patent number 4,255,363
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Issue date Mar 10, 1981
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Sigri Elektrographit Gesellschaft mit Beschrankter Haftung
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Wilhelm Geiger
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B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL