http://www.rssboard.org/rss-specification 720 XTF Search Results (docsPerPage=100;f277-subject=Tools -- United States -- Patents) https://catalog.wrhs.org/collections/search?docsPerPage%3D100;f277-subject%3DTools%20--%20United%20States%20--%20Patents Results for your query: docsPerPage=100;f277-subject=Tools -- United States -- Patents Thu, 01 Jan 1970 12:00:00 GMT Guide to American brace patents, 1829-1910. Pearson, Ronald W. https://catalog.wrhs.org/collections/view?docId=marc/skclmarc202890322046876.mrc https://catalog.wrhs.org/collections/view?docId=marc/skclmarc202890322046876.mrc Thu, 01 Jan 1970 12:00:00 GMT