| http://www.w3.org/ns/prov#value | - This variation in drag force may also be accomplished through the selective application of friction modifying materials or coatings such as oils, jells, greases, or coatings which increase friction. [0139] As stylette 316 is retracted in a proximal direction and shield 300 is extended in a distal direction, retainer 414 rotates in a counter clockwise direction (FIG. 4) relative to longitudinal axi
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