Successively with Remy Electric Company, M. Rumley Company, Burnett Larsh Company, Day-Fan Motor Company, 1919-1920. With Master Electric Company, Dayton, 1920-1957, president, 1920-1941, Chairman of the Board, 1940-1957. President, owner Tungston Plantation, Inc., 1937-1960, Miami Ships (formerly Newport Ships), 1941-1954.
Operator MiLarsh Laboratory, Miami, Florida, 1941-1964. President Daytrol Corporation (now The Larsh Corporation 1969), Dayton, since 1955.