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| Antique 523a Keuffel & Esser N-4100 patent 1900 slide rule |
| 523a |
| $40.00 |
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Slide Rule has Pat. June 5 1900 N-4100 Keuffel & Esser NY made in USA with N-4100 on one end and 411906 on side. Rule needs cleaned up has previous owners initials on back case is worn. More pictures upon request. |
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