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3587338
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Patent number 3,587,338
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Issue date Jun 28, 1971
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F27 - FURNACES KILNS OVENS RETORTS
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3517915
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Patent number 3,517,915
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Issue date Jun 30, 1970
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F27 - FURNACES KILNS OVENS RETORTS
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3257104
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Patent number 3,257,104
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Issue date Jun 21, 1966
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F27 - FURNACES KILNS OVENS RETORTS
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2910286
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Patent number 2,910,286
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Issue date Oct 27, 1959
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F27 - FURNACES KILNS OVENS RETORTS
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2663201
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Patent number 2,663,201
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Issue date Dec 22, 1953
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F27 - FURNACES KILNS OVENS RETORTS