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When the hydraulic pressure is removed from the well, small grains of hydraulic fracturing proppants (either sand or aluminium oxide) hold the fractures open. Hydraulic fracturing began as an experiment in 1947, and the first commercially successful application followed in 1950.
Kaisers Never Retrench: The History of Kaiser-Frazer, Part 1. THE POSTWAR BOOM. The first production Kaiser and Frazer automobiles came off the Willow Run line on May 29, 1946. The first cars were shipped to dealers on June 22; all were registered as 1947 models. Despite Kaiser and Frazerâs earlier talk of inexpensive small cars, neither model was anything close to a low-priced economy car.