Where does the word breathalyzer come from? - AlcoDigital

The word ‘breathalyser’ was originally trade-marked by a US company better known for its guns; Smith & Wesson, but was later sold to European Company Dräeger and has become known as a general trademark for all such instruments. In the USA it was more common to spell the breathalyzer with a “z” and this has also become more common throughout the world.

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