Comptometer - Model J
Comptometer Model J
"The final mass-produced shoebox model was the long-lived "J" with serial numbers starting somewhere around 250,000 (earliest known serial is J-249,633, latest known is J-394,374). It first appeared in February of 1926 and was clearly intended to replace the H-model and was set it off visually from its predecessors by its green keys which replaced the traditonal black.

Altho the "J" had no major new features, many operational aspects were markedly improved and it received wide acceptance in the late "roaring 20s". The model was in constant production until the start of WWII concurrently with the newer electric (K) and "streamlined" (M) models. Many of the survivor examples were still in operation at major U.S. corporations until the late 1970s, a remarkable record spanning some fifty years of useful service

Brooke W. Boering (aka Vagabondo) - The Comptometer Memorial Website

Source: The Comptometer Memorial Website

X-Number World