| http://www.w3.org/ns/prov#value | - It is conceivable that an altogether different type of pickup device, than, the one specifically described, with reference to .FIGS. 2 and 3, could be employed, such as, for example, a magnetosti'ictive device, or a magnetic pickup device. shown in F1G..6, which is merely illustrative of the principles said transducer being mounted in a housing including means mechanically connected to said housin
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