4. Metal deforming
  5. By tool-couple pressing together adjacent surface portions...
  6. To form longitudinally-seamed tube

Dale R. Foster

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Companion duct system

Pipes and tubular conduits – Combined – With end structure
Reexamination Certificate

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Insulation spool apparatus for lining ductwork

Winding – tensioning – or guiding – Unwinding – With supply coil replenishment
Reexamination Certificate

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Method of attaching a connector element to a duct flange

Metal working – Method of mechanical manufacture – Obtaining plural product pieces from unitary workpiece
Reexamination Certificate

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Pittsburgh seam closer having single seaming roll

Metal deforming – By tool-couple pressing together adjacent surface portions... – To form longitudinally-seamed tube
Patent

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Profile ID: LFUS-PAI-P-1594400

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