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Keuffel and Esser Mannheim "POWER TRIG" Slide Rule 4110 13" Linear slide rule 2004.010.0726 Keuffel & Esser Co. View |
Keuffel and Esser "Challenge" N9725 1/2 drafting set 2004.010.0744 Keuffel & Esser Co. View |
tracing divider 2004.010.0745 View |
Keuffel and Esser Pounce for Tracing Cloth 2004.010.0746 Keuffel & Esser Co. View |
Woollams-Seeney Artillery slide rule 2004.010.0749 E. J. Woollams-Seeney 1918 View |
Keuffel and Esser Universal Duplex Slide Rule "prototype" 4090 10" Linear slide rule 2005.013.001 Keuffel & Esser Co. View |
Keuffel and Esser Polyphase Duplex with clam shell cursor 4083 16" Linear slide rule 2008.010.001 Keuffel & Esser Co. View |
Tavernier-Gravet Mannheim linear 14" slide rule IN-0977 Tavernier-Gravet 1889 View |
Keuffel and Esser Mannheim Merchant's Slide Rule 4150-1 5" Linear slide rule IN-1539 Keuffel & Esser Co. View |
Keuffel and Esser Log Log Duplex Decitrig 4081-3 10" Linear slide rule IN-1569 Keuffel & Esser Co. View |
Keuffel and Esser Fuller spiral slide rule IN-1911 Keuffel & Esser Co. View |
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