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2. Drain-waste-vent system - Wikipedia

   en.wikipedia.org/wiki/Drain-waste-vent_system

   In the U.S., every plumbing fixture must also be coupled to the system's vent piping. [1] Without a vent, negative pressure can slow the flow of water leaving the system, resulting in clogs, or cause siphonage to empty a trap. The high point of the vent system (the top of its "soil stack") must be open to the exterior at atmospheric pressure.

3. Central Aircraft Manufacturing Company - Wikipedia

   en.wikipedia.org/wiki/Central_Aircraft...

   The Central Aircraft Manufacturing Company (CAMCO; Chinese: 中央飛機製造廠), also known as the Loiwing Factory (雷允飛機製造廠) after they moved to Yunnan, was a Chinese aircraft manufacturer established by American entrepreneur William D. Pawley in the 1930s.

4. Wikipedia:WikiProject Abandoned Drafts/Stale drafts/Full/2 ...

   en.wikipedia.org/wiki/Wikipedia:WikiProject...

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