| http://www.w3.org/ns/prov#value | - In addition, the bearing plates 64 and 70 guide the crosshead 16 longitudinally with respect to the column 14.When the housing portion 52, including the bearing plates 64 and 70 are slidably positioned about the column 14, a cylindrically-shaped chamber 76 is defined between the outer cylindrical surface 67 of the column 14, the bearing plates 64 and 70and the housing portion 52, as best shown in
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