In 1968, Statitrol Corp. owned by Duane D. Pearsall became the first US manufacturer to introduce a UL approved commercial ionization smoke detector system. This video shows prototypes and and early production models from the private collection of Duane D. Pearsall.
The K-8 school I went to for kindergarten has that same smoke detector seen at 2:58, but it's rebranded by Simplex Time Recorder (the school was built in 1974 with an old Simplex 4208 fire alarm system, now a 4005 or something.)
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