I first hired Jeff Frey & Associates for industrial photography back in the mid-1990s and used them for projects almost every year since.  Jeff's got the studio for this sort of work (conveniently across the hall from Lake Superior Brewing).  He's also good on location.  I once hauled him to a parts yard in a Hibbing mine dump and the parts photos were great.   

Jeff's the only person I've hired for parts shoots.  I've worked with many more excellent photographers here.  Derek Montgomery, Fitz Photography, Jack Rendulich and Amanda Hansmeyer are four I've worked with recently.  All projects were portraits and locations.   I'm sure they can show you industrial examples.