Converted Flamethrower 40
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In 1940 Swiss police started using converted backpack liquid-firing flamethrowers as riot control weapons called Umgebaute Flammenwerfer 40 (Converted Flamethrower 40), which fire a powerful jet of water solution of CN gas, probably 0.5% CN, but the proportion can be varied.
When the protests started in 1979 about building the Runway West (Startbahn-West) at Frankfurt-am-Main in West Germany, some Converted Flamethrower 40's were lent to the German police.
Some police still use them, e.g. in Aargau in Switzerland.