See this press release ("Hemisphere GPS Awarded Four New Patents for Positioning and Automated Steering") for the Physics 903.
Hemisphere GPS (HEM.TO) is one of three positions I currently have that are Aaron Edelheit picks. Again, it's worth signing up for guest access to the Value Investors Club to read Edelheit's initial write-up, under his pseudonym "Issambres839". Hemisphere is also a holding of Daniel Wahl and Ravinsu (who doesn't have a blog yet, as far as I know, but occasionally graces us with his comments here). I've mentioned Hemisphere here before a few times, but I don't think I've explained what the company's business is. Here is a layman's description, in a nutshell:
If you've ever mowed a lawn or spread fertilizer or seeds on a lawn, you've probably overlapped your rows slightly, to make sure you covered the whole area of your lawn. Commercial farmers have long done essentially the same thing. When a commercial farmer is working with tens of thousands of acres, all that overlap can lead to the waste of a lot of (increasingly expensive) fuel, fertilizer, and seeds. Hemisphere is a "precision agriculture" company. By using satellite guidance systems, Hemisphere's equipment precisely steers tractors and other agricultural equipment, obviating the need for overlap, and saving farmers a lot fuel, fertilizer, and seeds -- and, consequently, a lot of money.
In a sense, Hemisphere GPS is to the agriculture industry what Alloy Steel International is to the mining industry. Both companies' products enable operators in their respective industries to operate more efficiently.