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Summary
| Description |
English: Napier's Promptuary: Examples of three of the mask strips, for the digits 3, 6 and 9. Each has five copies of the mask pattern, making them suitable for multiplying 5-digit numbers |
| Date | |
| Source | Own work |
| Author | Gnomon42 |
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 13:34, 2 April 2020 | | 1,172 × 766 (16 KB) | Gnomon42 | Uploaded own work with UploadWizard |
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