| http://www.w3.org/ns/prov#value | - Conductive contacts 134 are disposed on the inner surfaces of lower portion 132a and upper portion 132c, so that when ball 130 is disposed in either the upper or the lower portions, it connects the contacts 134.As shown in FIG. 13A, contacts 134 (two of which are connected in common) are wired in series with a normally-open relay 140 and battery 28, which controls a circuit including battery 28 an
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