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Comptometer
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===Wooden boxes=== {{unreferenced section|date=October 2022}} The first machines were built using wooden boxes, which made them lighter but more fragile. They were called the "woodies", and about {{formatnum:6500}} machines were built in between 1887 and 1903. Two major improvements happened during the first years of production: the first was the insertion of carry inhibit push buttons for quicker operations of subtraction and the second was the color grouping of the columns of keys (three by three except for the first two columns that represent hundredths). Felt continually improved his machine with seven patents filed during the first ten years. These included the patents that he took for the Comptograph. Each row of keys is differentiated from the one above and the one below by a different tactile feel: the even rows have round and raised keys and the odd rows have flat and oblong keys. The keys of the first machines, with their metal rims, are similar to the typewriters keys of the same period. Plastic keys were also introduced very early on but their rows do not have that tactile difference. The woodies had a three-part zeroing mechanism: a lever, a lever stop, and a knob. In order to reset the machine, first push the lever toward the stop, start rotating the knob and release the lever as soon as the result numbers start to move. Continue rotating the knob until all the result numbers are reset. [[Image:Comptometer Model A.jpg|thumb|right|<div align="center">Model A (1905)</div>]]
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