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2. Sandy Springs, Georgia - Wikipedia

   en.wikipedia.org/wiki/Sandy_Springs,_Georgia

   South Springs or Sandy Springs ITP, an acronym for "inside the perimeter", refers to a portion of the city which extends south of Interstate 285, colloquially referred to as "the perimeter". [ 29 ] [ 30 ] It is located north of the City of Atlanta border, east of the Riverside district, south of Interstate 285, and west of the Brookhaven ...

3. Sliding door operator - Wikipedia

   en.wikipedia.org/wiki/Sliding_door_operator

   A door operator may be triggered in various ways: Approach Sensor (such as a radar sensor) - the door opens when a user approaches it. Pushbutton - the door opens when a user presses a button. Access control - the door opens when an access control system determines the user is authorized to go through. Automatically (in the case of elevators).

4. Governor (device) - Wikipedia

   en.wikipedia.org/wiki/Governor_(device)

   A governor, or speed limiter or controller, is a device used to measure and regulate the speed of a machine, such as an engine.. A classic example is the centrifugal governor, also known as the Watt or fly-ball governor on a reciprocating steam engine, which uses the effect of inertial force on rotating weights driven by the machine output shaft to regulate its speed by altering the input flow ...