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US1957915A
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Production of seamless tubes
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US1957916A
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Apparatus for and method of producing metal tubes
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US1930698A
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Tube-reducing mill
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US1859851A
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Straightening machine
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US1906286A
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Tube expanding mill
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US1736099A
|
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Tube-forming mill
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US1762427A
|
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Tube-rotating apparatus
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US1758413A
|
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Mandrel-bar-supporting apparatus for piercing mills
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US1712972A
|
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Method of forming blanks for making seamless tubes
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US1643353A
|
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Universal coupling
|
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US1622744A
|
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Tube-forming mill
|
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US1498130A
|
|
Tube expanding and smoothing mills
|
|
US1478772A
|
|
Tube-reducing mill
|
|
US1474800A
|
|
Method of making seamless tubes
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US1414489A
|
|
Annealing and other furnace
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US1368413A
|
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Tube-rolling mechanism
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CA329412A
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Tube expanding mill
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