On This Day October 2

The first ball-based computer mouse was developed by German company Telefunken for their TR 86 process computer system. The device was named Rollkugel (German for "rolling ball") and released on October 2, 1968. Telefunken considered their invention too small to apply for a patent. 

The Telefunken Rollkugel RKS 100-86 . By Marcin Wichary

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