| 摘要 |
In this raising gig, each working roll is divided into at least two coaxial working rolls 13a, 13b; 14a, 14b each extending over at most half the length of the drum and the contiguous ends of two coaxial working rolls are mounted to rotate in adjacent bearings 16. The coaxial rolls 13a, 13b; 14a, 14b may be coupled together 17 or driven independently of one another. <IMAGE
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