| http://www.w3.org/ns/prov#value | - ithdrawing the liquid material, such as water, oil, etc., the depth of which is to be determined, and a transmission line or wave guide 16 constructed of stainless steel and welded in place in apertures of suitable size and shape in the top and bottom of container 10, Transmission line 16 consists of a-number of disks 18, 18 connected together by stalks 20, 20 of relatively small diameter.
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