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Ventilation device
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Patent number 4,449,574
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Issue date May 22, 1984
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Mitsubishi Denki Kabushiki Kaisha
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Masataka Yoshino
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F24 - HEATING RANGES VENTILATING
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3559726
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Patent number 3,559,726
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Issue date Feb 2, 1971
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G01 - MEASURING TESTING
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3467175
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Patent number 3,467,175
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Issue date Sep 16, 1969
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G01 - MEASURING TESTING
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2847193
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Patent number 2,847,193
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Issue date Aug 12, 1958
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F28 - HEAT EXCHANGE IN GENERAL
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2508212
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Patent number 2,508,212
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Issue date May 16, 1950
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A23 - FOODS OR FOODSTUFFS THEIR TREATMENT, NOT COVERED BY OTHER CLASSES
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2353144
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Patent number 2,353,144
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Issue date Jul 11, 1944
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F24 - HEATING RANGES VENTILATING
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1493938
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Patent number 1,493,938
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Issue date May 13, 1924
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F01 - MACHINES OR ENGINES IN GENERAL ENGINE PLANTS IN GENERAL STEAM ENGINES
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231157
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Patent number 231,157
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Issue date Aug 17, 1880
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F24 - HEATING RANGES VENTILATING
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168123
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Patent number 168,123
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Issue date Sep 28, 1875
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F24 - HEATING RANGES VENTILATING
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121522
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Patent number 121,522
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Issue date Dec 5, 1871
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F24 - HEATING RANGES VENTILATING