| http://www.w3.org/ns/prov#value | - These and other objects and advantages are secured by this invention which may be more fully understood by reference to the accompanying drawings, in which: FIG. 1 is an elevation of a single drum filling unit showing a drum in place to be filled; FIG. 2 is an end elevation of FIG. 1 on a slightly larger scale, the drum of course being at right angles to the position shown in FIG. 1; FIG. 3 is a s
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