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3. R.L. Angstadt and F.R. Hurley, U.S. patent No. 3,427,175, Feb. 11, 1969.
4. V. Tokay, U.S. Patent No. 4,337,094, June 1982.
5. P.A. Rosskopf, U.S. Patent No. 4,373,956, Feb. 15, 1983.