Hairpin spring switches
Apple designed and patented their own clicky switch, hairpin spring. In most cases, these have a clear keystem. However, in the version of the Apple IIc keyboard with a vertical return key, a red switch was used.
Apple hairpin spring switches were rebranded by alterations to the moulds that replaced the Apple logo with the letter “G”. Such switches have been found in a Rhino Robots Keyboard Emulator, manufactured in 1989 or later. The same switches were also used in the Cybernetic Data Products KB-74, found with a manufacture date of March 1991. In the latter case, the hairpin spring is absent, presumably leaving a linear switch. Neither Rhino Robots nor Cybernetic Data Products appears to still be in business.