Original oil and gas trade magazine vintage ad for DORR-OLIVER INC, of Stamford, CT. The D-O Component Filter lets you convert to any one of 6 discharge methods. Webrol belt, scraper, wire, string, roll, and pre-coat scraper discharge. It is made possible by simple, pre-designed, interchangeable attachments to the filter. Provides advantage in both performance and costs. This unique 1962 petroleum refining process equipment magazine advertisement would display beautifully matted and framed. Two page gatefold advertisement.