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Collections
in Cryptology -
Grilles
Key mechanisms in computation... |
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An Improved Apparatus
for Writing and Reading Cipher Correspondence
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 "Writing Desk" |
 "Perforated Plate" |
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WW2 German Grille |
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 (National Cryptologic Museum Collection) |
 US KL-99 Cylindrical grille device (left) with cylinders (above). |
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