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Canadian Patents Database
"This database lets you access over 75 years of patent descriptions and images. You can search, retrieve and study more than 1,900,000 patent documents." Image databases go back to 1920, bibliographic descriptions back to 1869, and text of the abstracts and claims back to 1978. From the Canadian Intellectual Property Office (CIPO).
http://brevets-patents.ic.gc.ca/opic-cipo/cpd/eng/introduction.html
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