Original oil and gas trade magazine vintage ad for DARLING VALVE & MANUFACTURING COMPANY, of Williamsport, PA. Branch Offices were in New York City, Chicago, Oklahoma City and Houston. I May Not Know..
Original oil and gas trade magazine vintage ad for THE DAYTON RUBBER MANUFACTURING COMPANY of Dayton, OH. Here's the Drive for More Efficient Power Transmission. Dayton Cog-Belt Drives Revolutionize..