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Essay text:
From the start of the
production of elevators through today, there have been numerous and boundless
improvements made on their structure and how they operate: all due to the advancement
of mathematics and technology.
The first elevator developed was known as a manual elevator. This system of
elevators used "relay logic". Relay logic was a simple wiring based on circuits. This type
of elevator did not transfer people from one level to another, only cargo. *****
The second type of elevators was developed in the 1800s. These elevators were
powered by steam. At first, these elevators were used solely to transport freight in
factories and ore in mines...
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