Rafael, I would love to connect with you regarding JP Ehrmann. I have done some research on my end too and would love to share notes. I own several of his double rules and a friend has his original toolbox! I'm also in contact with someone familiar with his family tree - his grandfather in Switzerland was also a machinist! I don't think I can message on here yet to share contact info - maybe because I'm a new member?! We could start a thread on it I suppose.
Joe welcome to the Creek, to become a Contributor costs $6. It will provide you with the ability to see SMC hosted images and also an ability to send private messages to other contributing members.
Were all of the people named Rafael Herrera in Pittsburg, PA?
jtk
"A pessimist sees the difficulty in every opportunity; an optimist sees the opportunity in every difficulty."
- Sir Winston Churchill (1874-1965)
Thanks Jim. There were none in PA that look like a fit. Rafael - message me from this Facebook post. I have pics of a couple JP Ehrmann double rules. I was going to sell them but decided to keep them. https://www.facebook.com/marketplace...6709974981122/
Looks a lot like a Brown & Sharpe 554 tool makers square.
In the machining world, those small machinist squares are very common - lukfin, B&S, Starrett, General, all made them, and variations of (like ones with the ability to change angles or blade types). This one is weird because its a double rule, and made by a very small maker who, as far as I can tell, only made this one tool.