The bowling balls

"10 November 1972: CERN’s Bent Stumpe places an order for 12 bowling balls for a total cost of 95 US dollars. Although not evident at first sight, he is buying the heart of some of the first tracking devices to be used in the SPS control room. Today, Bent Stumpe’s device would be called a desktop mouse…"

http://cdsweb.cern.ch/journal/CERNBulletin/2010/21/News%20Articles/1265855?ln=en