The earliest prototype of the carbon monoxide alarm was created by Chester Gordon and James Lowe in 1925. They were employees of the American Telephone and Telegraph Company at the time. It was originally designed for commercial workers who worked in tight spaces in order that they could detect the presence of gas. However, this first alarm looked nothing like the alarms we see in buildings today. The original alarm used a crushed glass container, which contained palladium chloride, acetone and other chemicals in order to detect the CO.
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