![Document Locking: Fold + Lock-O [in a wrapper] — Signed, Sealed, & Undelivered](https://images.squarespace-cdn.com/content/v1/5560f6c8e4b004a8dfc42b4e/1439649103829-V6BMIMUTXNMJDCZQX88P/Screen+Shot+2015-08-12+at+5.44.35+AM.png?format=2500w "Document Locking: Fold + Lock-O [in a wrapper] — Signed, Sealed, & Undelivered")
Document Locking: Fold + Lock-O [in a wrapper] — Signed, Sealed, & Undelivered
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Letterlocking
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Nakamura Lock Paper Airplane
How to Fold (and Lock) a Letter : 6 Steps - Instructables
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The clever folds that kept letters secret - BBC Future
