| http://www.w3.org/ns/prov#value | - Pitot tubes areemployed in connection with flow meters for measuring steam, gases or other liquids or fluids they frequently become clogged with foreign matter or are rendered otherwise defective in their operation, and it necessarilyresults in the shutting oii of the line to permit of their removal, examination and cleansing according to the present practice. i It is, therefore, one of the princi
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