the user's presence. our clothing is intended to provide conspicuity of the wearer in any light condition when viewed by operators of vehicles or other mechanized equipment during daylight conditions and under illumination of headlights in the dark. en iso is divided into three classes, in accordance...
the user's presence. our clothing is intended to provide conspicuity of the wearer in any light condition when viewed by operators of vehicles or other mechanized equipment during daylight conditions and under illumination of headlights in the dark. en iso is divided into three classes, in accordance...
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controlled beam of sunlight to a distant station to be used as a marker for geodetic survey work, and was suggested as a means of telegraphic communications. [ ] this is the first reliably documented heliographic device, [ ] despite much speculation about possible ancient incidents of sun-flash signalling...