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An A-frame is a basic structure designed to bear a load in a lightweight economical manner. The simplest form of an A-frame is two similarly sized beams , arranged in an angle of 45 degrees or less, attached at the top, like an uppercase letter 'A'.
An A-frame ceiling can be open to the top rafters. Although the triangle shape of the A-frame has been present throughout history, it surged in popularity around the world from roughly the mid-1950s through the 1970s. It was during the post–World War II era that the A-frame acquired its most defining characteristics.
The Model T featured a simple "ladder" frame design without a K-member or X-member. The Model A frame, while more substantial than the Model T, still used a basic ladder design and was fitted with front, center, and rear crossmembers. In contrast, the 1932 Ford frame was equipped with a K-member for enhanced structural support.
The Strowger switch is the first commercially successful electromechanical stepping switch telephone exchange system. It was developed by the Strowger Automatic Telephone Exchange Company founded in 1891 by Almon Brown Strowger. Because of its operational characteristics, it is also known as a step-by-step (SXS) switch.
Shay Motors Corporation was an automobile company founded by Harry J. Shay in February 1978 as the Model A & Model T Motor Car Reproduction Corporation. [1] Harry Shay arranged with Ford Motor Company to build a limited run, modern-day reproduction of the Ford Model A Roadster, with a rumble seat, that was to be sold through the network of Ford Automobile Dealers and built in Battle Creek ...
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A stepper motor, also known as step motor or stepping motor, [1] is a brushless DC electric motor that rotates in a series of small and discrete angular steps. [2] Stepper motors can be set to any given step position without needing a position sensor for feedback. The step position can be rapidly increased or decreased to create continuous ...
Crews were in the process of “stepping the crane” during the construction of a high-rise building when a section being prepared to increase the crane's height came loose, Fort Lauderdale Fire ...