Hall Effect Switch Keyboards
Hall Effect Switch
Hall Effect Key Switch is a high quality and expensive to manufacture switch used in the 1980s mostly. It is used by lisp machine keyboards. [see Lisp Machine Keyboards]
Hall Effect Switch basically uses a magnet attached to a slider. When the magnet comes close to a microchip, electric flows thru the circuit. No need contact.
Hall Effect Switch is most expensive to make, and most reliable. Each switch is rated at billions of presses. In context, Cherry MX switches are rated at 50 million presses.