I'm working on something, using patent drawings...
Drawings from the following patents are currently used:
4,118,611 - Buckling spring torsional snap actuator, invented by Richard Hunter Harris, assigned to International Business Machines Corporation, filed 1977-08-30
4,584,444 - Keyboard switch, invented by Takao Nagashima, assigned to Topre Corporation, filed 1984-09-21
I'm trying to find the patents for the Cherry MX and Alps switches...
Edit: Is patent 4,186,290 an Alps? It looks like one, and it belongs to Alps Electric, and was designed for computer terminal use, but I'm not 100% sure that it's actually what I'm looking for. Take a look at the diagrams
here. (They're in TIFF format, though, so you'll need a TIFF plugin such as AlternaTIFF to view them.)
I'm gonna use figure 7 (on sheet 5, which is page 6) if it is, because that one matches the style of the other drawings I've got.
Edit 2: Or 4,249,055 is also mentioned for that application...
Edit 3: Looks like 4,467,160 is the Cherry MX (and I also found the ML.) Annoyingly, that patent doesn't have any drawings in the same style...