File:Keuffel and Esser Portland cement slide rule-IMG 5831-gradient.jpg
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 09:05, 12 April 2020 | 4,500 × 3,000 (421 KB) | Rama | == {{int:filedesc}} == {{Art Photo |wikidata = Q90246171 |artwork license = |photo description = |photo date = |photographer = {{u|Rama}} |source = {{own}} |photo license = {{self|Cc-by-sa-3.0-fr|Cc-by-sa-2.0-fr|CeCILL|attribution=Rama}} |other_versions = }} Category:Keuffel and Esser Portland Cement slide rule-2004.010.0464 |
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