I googled looking for relevant info before my post and did not see this. Pretty interesting.
I've been looking as well. I've worked for the Cat dealership in Alabama for 20 years. I was on a factory tour at Cat HQ in Peoria with some of our customers a couple years ago and struck up a conversation with one of the main promo guys at Cat and he informed me of this. It's one of those odd facts that just sticks with you once you hear about it.
Once you think about it though it makes sense. Think of how many Cat hats, tags, shirts, decals, boots, and all the rest you see out and about.