1920's rewired american green porcelain enameled ceiling light fixture designed and fabricated by the benjamin electric mfg. co., chicago, ills. the ceiling fixture contains the original uno fitter and socket with chain and spun brass ceiling canopy. the salvaged chicago industrial factory fixture remains in good shape with no damage evident to the porcelain enameled shade or socket. the benjamin electric manufacturing company was a chicago, illinois electrical company was founded by reuben berkley benjamin in the late 19th century with its first filed patent for an electric lamp socket in 1898. the company went on to manufacture various other electrical products. one of benjamin's most notable products was their series of non-contact fire alarm horns, introduced in the early 1920's. they were available in flush-mount, single, and double projector versions, in either red or gray. these horns were mainly used by ibm, and later simplexgrinnell up until the 1960's. in 1958, benjamin was bought out by thomas industries, inc. priced individually.