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From: ------
I am not sure about the true position calculator you refered to, but in the early 1970's I bought a "Universal Reference Calculator" that shows screw data, etc. This is a "slip stick" style reference chart by TAD Products of Beverly, MA. I recently tried to contact the company at the address on the calculator and the letter was returned as undeliverable. I would like to contact the company to see what else they offer, but have not been able to locate them.
If you or anyone else has information on this company, please contact me at rsc@qnet.com.