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2. A. O. Smith - Wikipedia

   en.wikipedia.org/wiki/A._O._Smith

   The A. O. Smith Foundation is a private, nonprofit organization, founded in 1955, that has contributed nearly $50 million to qualifying charitable, educational, scientific, literary, and civic organizations located primarily in communities where A. O. Smith Corporation has facilities. The support for the Foundation comes from the profits of A ...

3. Mechanism of diving regulators - Wikipedia

   en.wikipedia.org/wiki/Mechanism_of_diving_regulators

   The purge button (top-centre) is held away from the diaphragm by a spring. The valve is closed. The mechanism of diving regulators is the arrangement of components and function of gas pressure regulators used in the systems which supply breathing gases for underwater diving.

4. List of abbreviations in oil and gas exploration and production

   en.wikipedia.org/wiki/List_of_abbreviations_in...

   PBU – pressure build-up (applies to integrity testing on valves [citation needed]) PCA – production concession agreement; PCB – polychlorinated biphenyl; PCCC – pressure containing anti‐corrosion caps; PCCL – perforation casing collar locator log; PCDC – pressure-cased directional (geometry i.e. borehole survey) MWD tool

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