D04B9/00—Circular knitting machines with independently-movable needles
D04B9/42—Circular knitting machines with independently-movable needles specially adapted for producing goods of particular configuration
D04B9/46—Circular knitting machines with independently-movable needles specially adapted for producing goods of particular configuration stockings, or portions thereof
D04B9/54—Circular knitting machines with independently-movable needles specially adapted for producing goods of particular configuration stockings, or portions thereof welts, e.g. double or turned welts