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US1825259A
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Apparatus for heating air and other gases for industrial uses
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US1687825A
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Die block and method of treating steel for use in the manufacture thereof
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US1535146A
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|
Method of heating gaseous fluids
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CA185463A
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Gas drier
|
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CA183664A
|
|
Gas cleaning apparatus
|
|
CA183663A
|
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Gas cleaning method
|
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US969769A
|
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Method and apparatus for cleaning gas.
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US1070398A
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Apparatus for and method of cleaning gases.
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US1032655A
|
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Method of manufacturing steel.
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|
US1032654A
|
|
Method of purifying iron.
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US1032653A
|
|
Method of manufacturing steel.
|
|
CA459366A
|
|
Process and apparatus for manufacture of metal products
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CA459365A
|
|
Apparatus for reduction of metallic materials
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CA256648A
|
|
Method of heating gaseous fluid
|
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CA444311A
|
|
Reduction of ore to metal
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