US2009476A
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Welding horn
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US1700508A
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Apparatus for producing continuous tubing
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US1681306A
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Machine for cutting to length continuously-forming tubing
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Apparatus for manufacturing continuous tubing from separate reels of skelp
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DE439960C
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Process for the manufacture of pipelines
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GB202130A
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Process of manufacturing metal tubing and apparatus therefor
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Apparatus for manufacturing tubes
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Method of manufacturing tubes
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CA352502A
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Welding horn
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CA267907A
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Tube cutter
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CA267908A
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Tube machine
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CA267909A
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Tube machine
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CA361537A
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Conveyor kick-off device
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