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  2. Panama Canal locks - Wikipedia

    en.wikipedia.org/wiki/Panama_Canal_locks

    [3] 24-hour time-lapse of the upper chamber of the Miraflores Locks. The lock chambers are 110 ft (33.53 m) wide by 1,050 ft (320 m) long, with a usable length of 1,000 ft (305 m). [4] These dimensions determine the maximum size of ships that can use the canal; this size is known as Panamax.

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  4. Electric gate - Wikipedia

    en.wikipedia.org/wiki/Electric_gate

    In 1884, a number of American newspapers reported that the French railway companies were about to adopt an electric gate opener. “A catch connected with an electro-magnet keeps a gate closed,” reported The National Tribune on October 9, 1884. [ 3 ]

  5. Lock (water navigation) - Wikipedia

    en.wikipedia.org/wiki/Lock_(water_navigation)

    A plan and side view of a generic, empty canal lock. A lock chamber separated from the rest of the canal by an upper pair and a lower pair of mitre gates.The gates in each pair close against each other at an 18° angle to approximate an arch against the water pressure on the "upstream" side of the gates when the water level on the "downstream" side is lower.

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  7. Swing-door operator - Wikipedia

    en.wikipedia.org/wiki/Swing-door_operator

    The majority of the operators open the door directly or through an arm. Overhead concealed mount—the operator is mounted above the door and rotates the door directly, through its pivot. Surface mount, push (scissor arm)—the operator is mounted on the wall above the door, on the approach side and pushes the door with a linkage of 2 arms.