File:US2742437 Houdry Auto Catalyst.pdf
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current | 06:10, 10 April 2009 | 1,158 × 1,702, 6 pages (409 KB) | imagescommonswiki>Hermann Luyken | {{Information |Description={{en|1=US Patent 2,742,437}} |Source=Freepatentsonline |Author=Eugene Houdry |Date=1956.04.17 |Permission= |other_versions= }} <!--{{ImageUpload|full}}--> Category:Patents |
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