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How long did the recent economic expansion last before the beginning of the Great Recession?
Control Signal
An electrical or electronic signal used to control the behavior of a system or device, directing its operation or response.
Trailer
Any of a number of different types of nonpowered, load-carrying vehicles towed by another vehicle.
Hold-Off Circuit
A type of circuit used to delay or prevent the activation of part of a system until certain conditions are met.
System Air Pressure
The pressure of the air in a pneumatic system, which is critical for the operation of air-powered tools or vehicles.
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