with means to handle flux or filler (class / ) tip or head alloy or polymetallic structure (class / ) adjustable or detachable head or tip (class / ) specialized pot (class / ) having means to treat flux or filler (class / ) solder form (class / ) with signal, indicator, gauge, or stop (class / ) apparatus...
equipment, professional document reproduction machines hi-fi and stereo systems hi-fi, television and video accessories intercom systems office machines and equipment public address and sound systems radar and radio navigation equipment radio and television broadcasting - equipment and systems signalling...
private. the line-of-sight distance between relay stations was limited by geography and weather, and prevented the optical telegraph from crossing wide expanses of water, unless a convenient island could be used for a relay station. a modern derivative of the semaphore system is flag semaphore , signalling...