SMITH, Acting Associate Justice.
Ernest J. Sweetland on July 3, 1920, filed an application in the United States Patent Office, praying for letters patent to a lubricating system combining a means for forcing or conveying, from internal combustion engines to a purifying chamber, lubricating oils befouled with dirt, metal particles, carbon sediment, and other foreign matter, a means in the purifying chamber for filtering the oil and cleaning it of its impurities, and...
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