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Pennwood Electric Company
1930s - 1972
The Pennwood Electric Company was founded in the early 1930's in Pittsburgh, PA. They are best known as the company who first to marketed a digital clock. The company also manufactured industrial timers, and other electric devices.
"Pennwood "Numechron" Clocks," Reverse Time page, http://www.uv201.com/Clock_Pages/pennwood.htm (accessed 06/17/2015) [unvetted]
"The Lawson Clock Story," DECOPIX, http://www.decopix.com/the_lawson_clock_story/ (accessed 06/17/2015) [unvetted]