| http://www.w3.org/ns/prov#value | - l of internal pipes in serted for tests or other purposes and wells used in connection with temperature recorders or in places where it is undesirable to remove the Pitot tube for cleaning and a vacuum is available for cleansing the tube openings while the same remains in place. lVith the above recited and other objects, advantages and uses in view the invention resides in the novel construction,
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