{HEAD ~ A pair} of {TAIL ~ rollers} 37 and 47 are rotatably supported by the machine 30 above each other and are formed with concave outer edges 38 and 48 between which the coiled wire 31 of the snake can be received 
of
{ HEAD ~ A pair } of { TAIL ~ rollers } 37 and 47 are rotatably supported by the machine 30 above each other and are formed with concave outer edges 38 and 48 between which the coiled wire 31 of the snake can be received
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