| http://www.w3.org/ns/prov#value | - While the flattened characteristic within the proportional zone PZ where the force versus air gap characteristics of FIG. 32 is complicated to explain from purely mathematical terms, it has been found that the size of the proportional zone depends upon a number of factors, including the permeability of the magnetic material of the pole piece and the angle B of the tapered portion 123 adjacent to t
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