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3666241
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Patent number 3,666,241
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Issue date May 30, 1972
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B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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2441711
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Patent number 2,441,711
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Issue date May 18, 1948
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B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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2260834
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Patent number 2,260,834
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Issue date Oct 28, 1941
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B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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1489786
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Patent number 1,489,786
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Issue date Apr 8, 1924
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B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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1489787
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Patent number 1,489,787
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Issue date Apr 8, 1924
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B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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90758
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Patent number 90,758
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Issue date Jun 1, 1869
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B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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53912
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Patent number 53,912
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Issue date Apr 10, 1866
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B01 - PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL