When did neon lights move from curiosity to a common commercial fixture in the United States?
Answer
Between 1923 and the late 1920s
The text specifies that the threshold for becoming truly common, meaning widespread and affordable adoption, took place rapidly after neon was introduced to the American market. While the first US installation occurred in 1923, the rapid acceptance and integration into commerce solidified the sign's status as a common fixture shortly thereafter. This transition period is pinpointed specifically as commencing between 1923 and the late 1920s, accelerating substantially through the 1930s and 1940s when businesses widely embraced the captivating visibility these bright, colorful lights offered after dark.

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