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• Decade: 1930s ×
• Written by: Walter L. Steffens ×
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1 result for “Owens-Corning Fiberglas”

1. Patent · September 25, 1934

   Heat Insulating Unit (US Patent 1,974,519, 1934)

   Walter L. Steffens received US Patent No. 1,974,519 on September 25, 1934, filed July 5, 1929. The patent's description opens (from the scanned text): My invention relates to insulation for build-' Fig. 2.