IBM's German Subsidiary, Deutsche Hollerith Maschinen, Introduces the First Automatic Sequence-Controlled Calculator

In September 1935 IBM’s German subsidiary, Deutsche Hollerith Maschinen (Dehomag) introduced the Dehomag D11 tabulator, the first automatic sequence-controlled calculator, incorporating internal instructions programmed with a plug board.

Kistermann, "The way to the first automatic sequence-controlled calculator: The 1935 DEHOMAG D 11 tabulator," IEEE Annals of the History of Computing XVII (1995): 33-49.