Hello. I'm interested in the historical evolution of lighting components. I have many old books and catalogs, but none of them have an answer to these questions: Who (and when) invented the UNO thread for shade holders on lamp sockets? What does "UNO" stand for? Is there a patent? If there is, what is the patent number? The UNO thread shows up in my 1916 GE catalog, but not yet in a 1914 Bryant Electric catalog. I don't have any 1917-20 catalogs. My post-1920 catalogs are chock-full of sockets with UNO threads, from all manufacturers. Thanks. Adam
[This message has been edited by adam (edited March 05, 2003).]
