Inspects, installs, repairs, overhauls, and calibrates control systems and intercommunicating equipment such as sensing devices, transducers, amplifiers, transmitters, receivers and recorders which utilize mechanical, hydraulic, pneumatic, thermal, chemical, electrical and electronic components employing multiple function circuits, signal integration, digital to analog conversion, P/I conversion, I/V conversion, potted circuits and solid state circuit boards, and/or electro-mechanical traffic signal control equipment such as controllers, coordinators, load switches, detectors, signal monitors and flashers, as applicable;