Ohmer Fare Register
The Ohmer fare register was, in various models, a mechanical device for registering and recording the fares of passengers on streetcars, busses and taxis in the early 20th century. It was invented and improved by members and employees of the Ohmer family of Dayton, Ohio. This latter company employed up to 9,000 people at one time and was a major manufacturer of precision equipment during World War 1.
Government Printing Office The Official Gazette of the United States Patent Office (Washington, DC: Government Printing Office, 1895)