My brother and I have total access to land that once had a junkyard. We've been taking various sized electric motors and removing the copper windings. Last week I found this Trimo pipe wrench. It was filthy and terribly rusted with no parts moving. My brother let it soak for 3 days in a Coke and cider vinegar solution. Yes, I know original color was not red, but black. Patent date is 3-15-18 but could have been made anytime up to 1954.Can anyone give a more precise date?
http://imgur.com/a/wk8Uk
http://imgur.com/a/wk8Uk