What he came up with was the Elograph coordinate measuring system.It was an input tablet that could measure where the user was pressing a stylus.Hurst quickly formed the Elographics company (now Elo TouchSystems) to make and sell the device.Working furiously to develop their concept,Hurst and his team took just three years to make a proper transparent version that could sit over a screen.Four years later,in 1977,they came up with what was to become the most popular technology for touch screens today.The five-wire resistive touch screen contains transparent layers that are squeezed together by the pressure of a finger touching them.Easily translated into electrical resistive data,this modern touchscreen is durable and offers high resolution. - See more at: http://www.spinfold.com/first-touchscreen-phone/#sthash.QhU4K2Lr.dpuf