signaling devices, in particular radio signal transmitters, acoustic signal transmitters being led installation beacons for transmitting status about machines, optical signal transmitters being led installation beacons for transmitting status about machines electric warning lights, flashing safety lights, and strobe lights being warning beacons, telecommunication signal towers, electric buzzers, electronic warning horns, sirens, signal bells, and radio elements being proximity sensors for warning and emergency purposes

'acoust':8 'beacon':14,26,43 'bell':54 'buzzer':48 'devic':2 'electr':32,47 'electron':49 'element':57 'emerg':64 'flash':35 'horn':51 'instal':13,25 'led':12,24 'light':34,37,40 'machin':19,31 'optic':20 'particular':4 'proxim':59 'purpos':65 'radio':5,56 'safeti':36 'sensor':60 'signal':1,6,9,21,45,53 'siren':52 'status':17,29 'strobe':39 'telecommun':44 'tower':46 'transmit':16,28 'transmitt':7,10,22 'warn':33,42,50,62

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