| http://www.w3.org/ns/prov#value | - These and other objects of the invention will become apparent from the following detailed description when taken in conjunction with the accompanying drawings, in which: FIGURE 1 is an elevation, in cross-section, of a selflubricated electrical contact brush; FIG. 2 is an elevation, in cross-section, of a self-lubricated electrical contact brush; and FIGS. 3 to 5 are elevations, partly in cross-se
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