US1745375A
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Air-circulating system for lumber-drying kilns
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US1736213A
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Method of and means for drying lumber
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US1731315A
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Method of and means for controlling the temperature of drying chambers
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US1773114A
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Device for indicating the degree of shrinkage or swelling of materials
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US1695738A
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Method of controlling the processing of materials
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US1736505A
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Moisture tester
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US1624754A
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Drying system
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US1621333A
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Heating unit and heating system for kilns
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US1503168A
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Method of and apparatus for kiln-drying lumber
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CA276289A
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Drying system
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CA275678A
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Heating unit and system for kilns
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CA296898A
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Lumber drying apparatus
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CA293844A
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Method of controlling the processing of materials
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CA277883A
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Heating system
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