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2. Backflow prevention device - Wikipedia

   en.wikipedia.org/wiki/Backflow_prevention_device

   A check valve is a basic form of backflow prevention, but often more complex devices are required because check valves are not considered to be reliable, when compared to more sophisticated devices with redundancies and reduced-pressure zones. [further explanation needed]

3. TRW Inc. - Wikipedia

   en.wikipedia.org/wiki/TRW_Inc.

   TRW Inc. was an American corporation involved in a variety of businesses, mainly aerospace, electronics, automotive, and credit reporting. [2] It was a pioneer in multiple fields including electronic components, integrated circuits, computers, software and systems engineering.

4. Draper Laboratory - Wikipedia

   en.wikipedia.org/wiki/Draper_Laboratory

   [28] [29] The company explained that the number 7 denotes the 7th lunar lander mission in which Draper Laboratory would be involved, after the six Apollo lunar landings. [29] The lander concept is based on a design by a Japanese company called ispace, which is a team member of Draper in this venture. [30]

5. News, Politics, Sports, Mail & Latest Headlines - AOL.com

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   Discover the latest breaking news in the U.S. and around the world — politics, weather, entertainment, lifestyle, finance, sports and much more.

6. Valve - Wikipedia

   en.wikipedia.org/wiki/Valve

   Depending on the type of valve, a disc can move linearly inside a valve, or rotate on the stem (as in a butterfly valve), or rotate on a hinge or trunnion (as in a check valve). A ball is a round valve member with one or more paths between ports passing through it.

7. AOL Mail

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   Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!