Datamp.org Patents https://www.datamp.org/ Recently added patents en-us US Patent: 830,980 https://www.datamp.org/patents/displayPatent.php?id=85364&pn=830,980 Door Holder Patentee: Samuel B. Dutro - Mason City IA Granted:1906-09-11

One of these appeared in a Martin J. Donnelly auction
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