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or prove authenticity. Some of these letter techniques, which could involve stitching or wax seals, were also employed to secure hand-made envelopes.Prior to 1840, all envelopes were handmade, including those for commercial use. In 1840 George Wilson of London was granted a patent for an envelope-cutting machine (patent: "an improved paper-cutting machine"); these machine-cut envelopes still needed to be folded by hand. In 1845, Edwin Hill and Warren De La Rue

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