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The lights may be turned on or off from either the top, bottom or intermediate floors of the staircase. They remain on until turned off manually. In a multiple occupancy dwelling, the drawback is that the cost of shared lighting is usually paid by the landlord. Individual tenants turn lights on, but have little reason to turn them off.
In building wiring, multiway switching is the interconnection of two or more electrical switches to control an electrical load from more than one location.A common application is in lighting, where it allows the control of lamps from multiple locations, for example in a hallway, stairwell, or large room.
Factors to consider when choosing a stair lift. A stair lift is a big investment, making it important to choose wisely. Consider these factors during your search. Type of staircase; straight or curved
The electric overhead garage door opener was invented by C.G. Johnson in 1926 in Hartford City, Indiana. [1] Electric Garage Door openers did not become popular until Era Meter Company of Chicago offered one after World War II where the overhead garage door could be opened via a key pad located on a post at the end of the driveway or a switch inside the garage.
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Passenger boarding stairs. Passenger boarding stairs, sometimes referred to as boarding ramps, stair car or aircraft steps, provide a mobile means to traverse between the aircraft doors and the ground. Because larger aircraft have door sills 5 to 20 feet (1.5 to 6.1 m) high, stairs facilitate safe boarding and deplaning.
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