1. G.W. Holbrook, P.L. Brown, US Patent 2,915,544 (1957), to Dow Corning Corp.
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3. O. Steward, G.B. Patent 1,014,156 (1965), to Dow Corning Corp.
4. L. Loree, O. Pierce, Y. Kim, US Patent 3,542,830; 3,647,740 (1970), to Dow Corning Corp.