LetterlockingBy: Jana Dambrogio, Daniel Starza Smith The rich history of a centuries old document security technologyfolding and securing a letter into its own envelope for deliveryand a comprehensive guide to learning how to make your own locked letters. Before the invention of the gummed envelope in the 1830s, how did people secure their private letters? The answer is letterlockingthe ingenious process of securing a letter using a combination of folds, tucks,
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