With the arrangement of the smaller diameter drive surface 30 and {HEAD ~ the larger diameter slip surfaces} 32, {TAIL ~ the marker tubing stock} 20 and the carrier 22 can be positioned in a substantially common plane as the product passes the print head 26 
With the arrangement of the smaller diameter drive surface 30 and { HEAD ~ the larger diameter slip surfaces } 32 , { TAIL ~ the marker tubing stock } 20 and the carrier 22 can be positioned in a substantially common plane as the product passes the print head 26
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