Hand-drawn sketch of envelope/packaging with notations

Part 51page 3471 pageDB Cooper-21508

Open in FBI Vault (Part 51, page 347 of the PDF)
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Id: Cooper-Part-51:347-347

Subject: Cooper Files: Cooper-Part-51:347-347

Document: Hand-drawn sketch of envelope/packaging with notations
Id: Cooper-Part-51:347-347
Page: https://cooper.theunsolved.net/documents/Cooper-Part-51%3A347-347

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FBI 164-81, Vault Part 51 p. 347 (DB Cooper-21508), Handwritten note — cooper.theunsolved.net/documents/Cooper-Part-51%3A347-347

[guess: Clk] No/Js (C [guess: 5 No. 2765] PU [guess: Source]

serial [guess: 4310] [guess: barb]

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b6 b7C

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DB Cooper-21508

Serials: [guess: 2765], [guess: serial 4310]