Assertion: spray sprinkler | /r/CapableOf | cool light steel construction
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text: From the early models of sprinklers in the mid-19th century, which kept the wooden floors of New England mills wet by spraying water in every direction, to the standard spray sprinklers of the 1950s, which cooled light steel construction by setting up an umbrella pattern of finer droplets, sprinklers have fulfilled their promise.