Vintage Bridgeport Brass Company Duplex Tubing Advertising Booklet. Bridgeport Brass Company Duplex Tubing Technical Bulletin No. 1950 Overall in very good condition. Minor wear, fold lines, old age toning and light soiling. Please view all the photos as the are intended to be part of the description and ask any questions you may have prior to bidding. I’m always willing to take additional photos or answered detailed questions. Ultimately I want you to be happy with your purchase but returns are costly and therefore are only accepted if the wrong item is sent or arrives significantly different than it was described. Thank you for understanding.