-
Period: to
60's
John Henry Holmes invented the first push-button phone on November 18 1963 -
Period: to
70's
the push button was invented by an unknown inventor on an unknown date -
Period: to
70's
At the same time,engineers were building complex machines controlled by rows and rows of switches and buttons. -
Period: to
70's
A push button switch is a small, sealed mechanism that completes an electric circuit when you press on it. When it's on, a small metal spring inside makes contact with two wires, allowing electricity to flow. -
Period: to
80's
A push-button is a simple switch mechanism for controlling some aspect of a machine or a process.