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  2. Butterfly valve - Wikipedia

    en.wikipedia.org/wiki/Butterfly_valve

    Butterfly valve with actuator electric valve - An electrically actuated butterfly valve is a quarter-turn valve controlled by an electric motor. It offers fast and precise flow regulation, remote operation, and versatility for various applications.

  3. Pennsylvania Railroad 1361 - Wikipedia

    en.wikipedia.org/wiki/Pennsylvania_Railroad_1361

    The RMM subsequently made plans to spin-off ownership of No. 1361 to a newly-formed group called Keystone Restoration and Preservation, Inc. (KR&P); KR&P would gain the rights to operate No. 1361 and raise funds for it, while the museum would retain the rights to display the locomotive on their property. [23]

  4. Valve - Wikipedia

    en.wikipedia.org/wiki/Valve

    These water valves are operated by rotary handles. A valve is a device or natural object that regulates, directs or controls the flow of a fluid (gases, liquids, fluidized solids, or slurries) by opening, closing, or partially obstructing various passageways. Valves are technically fittings, but are usually discussed as a separate category. In ...

  5. AOL Mail

    mail.aol.com

    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!

  6. Keystone View Company - Wikipedia

    en.wikipedia.org/wiki/Keystone_View_Company

    The Keystone View Company was a major distributor of stereographic images, and was located in Meadville, Pennsylvania. From 1892 through 1963 Keystone produced and distributed both educational and comic/sentimental stereoviews, and stereoscopes. By 1905 it was the world's largest stereographic company. In 1963 Department A (stereoviews sold to ...

  7. List of screw drives - Wikipedia

    en.wikipedia.org/wiki/List_of_screw_drives

    Type G resembles a butterfly, and lacks the center "knot". [65] This type of screw head is commonly used in the manufacture of mobile homes and recreational vehicles . [ 66 ] The clutch head was designed to be driven either with a flat-blade screwdriver or a clutch driver; but the screws are tamper-proof and secure, and cannot be unscrewed with ...

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