drop-out switch signal

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• Lights Out (radio show) — Lights Out was an extremely popular American old time radio program, an early example of a network series devoted mostly to horror and the supernatural, predating Suspense and Inner Sanctum . Versions of Lights Out aired on different networks, at …   Wikipedia

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• North American railroad signals — Main article: North American railway signaling Baltimore and Ohio Railroad Color Position Light bracket masts at Magnolia, West Virginia North American railroad signals generally fall into the category of multi headed electrically lit units… …   Wikipedia