| http://www.w3.org/ns/prov#value | - In one embodiment such as shown in FIG. 8, the reactances of the reference inductor 21 and the sensor inductor 1 and the resistances of the resistors 26, 28, are such that the bridge 22 is balanced when the sensor inductor 1 is removedfrom proximity of the tynes of the tyne assembly 2 and conversely unbalanced when the sensor inductor 1 is fully acted upon by the tynes of the tyne assembly 2.
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