Otto Steiger (engineer)

{{short description|Swiss engineer (1858–1923), designer of the Millionaire calculator}}

Otto Steiger (1858–1923) was a Swiss engineer. Steiger came from St. Gallen and lived in Munich.

Steiger is known for the invention and construction of the Millionaire mechanical calculator, the first commercially successful direct multiplication calculator (German patent 1892).{{Cite book |last=Arbel |first=Alexander |url=https://books.google.com/books?id=UiCODwAAQBAJ |title=Routes to the Information Revolution |date=2019-03-18 |publisher=Cambridge Scholars Publishing |isbn=978-1-5275-3150-5 |pages=38 |language=en}}