Pertec

Pertec Computer Corporation are, for keyboard purposes, notable for a couple of unusual keyboards:

• Pertec’s XL40 keyboard (with components dating to the end of 1977; additional photos), notable for using Micro Switch SD Series switches in a keyboard not made by Micro Switch themselves, although Micro Switch did make a nearly-identical keyboard, model 54SD15-16 (dated 8415)
• Unidentified Pertec keyboard with Elec-Trol Datakeys reed switches, the only keyboard to date to have ever been found with these switches.