A: Ottawa, Ontario, Canada, B: Ontario, Canada
In 1946 English engineer Ralph Benjamin invented the first trackball called roller ball, which was patented in 1947.[1]
In 1952 British electrical engineer Kenyon Taylor and team, working on the Royal Canadian Navy's DATAR (Digital Automated Tracking and Resolving) project (a pioneering computerized battlefield information system) invented a trackball precursor of the computer mouse. It used a standard Canadian five-pin bowling ball. The DATAR system was first successfully tested on Lake Ontario in autumn 1953.