The Siemens DCO (digital central office) electronic telephone switch was introduced in 1977 by Stromberg-Carlson, having been conceived by its new president, Leonard A. Muller, an ex IBM senior executive who infused Stromberg with his new digital awareness learned in IBM.
The Siemens DCO electronic telephone switch was introduced in 1977 by Stromberg-Carlson under the guidance of its president, Leonard A. Muller, an ex-IBM executive who brought digital expertise and knowledge gained from his time at IBM to Stromberg.