This post about sewing tubes without a presser foot or feed dogs suggests using a specialized machine.
What is the second machine in Elmy's answer here called?
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"Feed-off-the-arm sewing machines – A feed off the arm sewing machine’s design is unusual in that its arm bridges a u-shaped bed. Such machines are ideal for seaming the inseams of pants and jeans as well as the sides, sleeves, and shoulders of shirts."