Keys, lightbulbs tied to Thomas Edison go up for auction

TRENTON, N.J. (AP) — Keys to the New Jersey lab where Thomas Edison invented the phonograph are up for auction in Dallas, along with some of the lightbulbs that he perfected.
A Pittsburgh man acquired the items from his great aunt, who was married to one of the attorneys whose law firm represented Edison in patent lawsuits.
Tags on five of the six keys list the doors that they opened, including the Menlo Park lab which Edison opened in 1876 that became known as the “invention factory