| http://www.w3.org/ns/prov#value | - In order to reduce wear on the body, particularly along the lines of contact between the balls 134 and 136 and the body, inserts 142 and 144 of a hard metal such as tungsten carbide or the like may be set into the walls 28 and 30, as best shown in FIGS. 3 and 12.
|
