Original oil and gas trade magazine vintage ad for ACF INDUSTRIES of Houston, TX. M-K-M computer predicts performance. Unique strain gauge analyzer pre-solves your valve problems. In seconds, it gives answers that used to take days. The computer measures strain, applies corrections for temperature, test material and gauge factors and prints the results of its stress calculations. This unique 1962 old two-page gatefold oilfield petroleum industry magaine advertisement would display beautifully matted and framed.