Good point. I'd agree that a lab (like Edison's) would get just one WM. After all, the number of patents that come out of certain labs is surely quite large. And yes, many inventions are the result of corporate research, but the locations would have to be open to the public. That doesn't mean corporate locations can't be waymarked. A family member works for a large biotech firm (Beckman Coulter), and they've got a "heritage center" (with inventions) that is not only open to the public, but they actively welcome visitors. Also, although corporations do lots of inventing, there are many other spots that are much less, well, "corporate." Hewlett-Packard, for instance, started in a garage, and I'm sure many others have as well. Finally, the new "Core of Discovery" group is looking for a few officers. If you're interested, sign up!