Thomas Alva Edison’s door key to the 19th century lab in New Jersey where he invented the phonograph goes up for auction this weekend, along with light bulbs he perfected. Six keys in all from the famous inventor’s Menlo Park home and work place was set to be auctioned on Saturday in Dallas, along with five light bulbs, including two that he created. Heritage Auctions was scheduled to open the bidding on the two lots at 11 a.m. EST. The items were acquired by Charlie Knudsen, 69, of Pittsburgh and had belonged to his great-aunt. She was married to one of the attorneys whose law firm represented Edison in patent lawsuits. Tags on some of the keys list the doors that they opened, including Edison’s 1876 lab that became known as the “invention factory.” Another key says “motor shed,” and a third “shop.” Edison had applied for about 400 patents, including improvements to the incandescent bulb, before he left for New York City in 1882, said Kathleen Carlucci, director of the Thom...