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Mohler, Met. Finish., 43, (1945)
[13]
Brit. Patent 573,848, (1945)
[14]
U.S. Patent 2,497,988, (1950)
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Brit. Patent 602,027, (1948)
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U.S. Patent 2,538,417, (1951)
[17]
U.S. Patent 2,423,624, (1947)
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U.S. Patent 1,849,293, (1932)
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U.S. Patent 2,750,333, (1956)
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Waterman, Prod. Finish., 25, (1972)