| 摘要 |
A device for reducing tubes. Two annular sets of balls are axially spaced in a revolving drawing head and successively engage a tube as it is drawn through the head. The number of balls in one ring is different from that in the other, thereby smoothing out any helical grooves and ridges formed by the first set. The balls are individually mounted in sockets in threaded slugs carrying micrometer markings.
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