Inspiration for your machine icons?

I simply love the look of Production Line even though I haven’t played it hardly at all. I’m in the manufacturing industry building CAM software and would love to know your inspiration for your machine tool design! I’m trying to change the “look and feel” of our CAM software and would love some of your insight on the gorgeous design of your machine tools.

Looks like the icons were farmed out to a company named “easy” something? If I didn’t have the brain of a steel sieve I’d remember were I found that. I believe it was on a “site designed by” tag flying around somewhere. The main problem is having a company name that simply makes google explode.