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commutate; switch

change by reversal — verb change to the contrary The trend was reversed the tides turned against him public opinion turned when it was revealed that the president had an affair with a White House intern • Syn: ↑turn, ↑reverse • See Also: ↑turn on … Useful english dictionary
Inverter (electrical) — An inverter is an electrical device that converts direct current (DC) to alternating current (AC)[1]; the converted AC can be at any required voltage and frequency with the use of appropriate transformers, switching, and control circuits. Solid… … Wikipedia
Tyers Electric Train Tablet — Tyers #7 Electric Train Tablet System was a form of Railway Signalling for Single line railways used in New Zealand for close to 100 years until June 1994.The system used a hard red disk called a tablet a form of tokenOperationThe system required … Wikipedia