In the Czechoslovak army, until the 1950s, the following were used for night-time marking of contaminated areas, supply and evacuation routes to special decontamination sites, and for marking detours and passages in contaminated areas
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Until the 1950s, the Czechoslovak army used kerosene lamps, torches and other non-standard aids to mark contaminated areas at night, supply and evacuation routes to special decontamination sites, and detours and passages in contaminated areas. At the end of the 1950s, a simple device called the Si-58 Signalizer was developed. It went into mass production in 1960. The signal was designed to mark areas and routes with coloured flashing lights and intermittently lit direction indicators or light symbols, especially in conditions of reduced visibility. Symbols such as letters, arrows and differently coloured screens were used to
