Seismic vibrators, which are used in oil & gas to map the geophysical nature of the Earth below, use closed-circuit feedback to compare the LDT signal in the cylinders to the desired position and velocity of the electronic control system to offer a precise and repeatable frequency response of the vibrator. Image courtesy of Adobe Stock

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TransDigm supplies hydraulic components for a number of defense programs, including the F-35. The DoD inspector general says the company overcharges the government. | Photo By: Air Force Senior Airman Alexander Cook

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