| http://www.w3.org/ns/prov#value | - A Pitot-static tube unit comprising, in combination, a velocity head tube and a pressure head tube, means adapted for connecting the chambers of said tubes with a differential pressure controlled device, said means including openings above the lower portions of said tubes, respectively, a bafiie disposed across a portion of said velocity head tube, and a heating device lining the wall of said velo
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