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Keuffel and Esser Log Log Duplex Vector 4093-3 10" Linear slide rule IN-1964 Keuffel & Esser Co. View |
Keuffel and Esser Log Log Duplex Decitrig 4081-3 10" Linear slide rule IN-1971 Keuffel & Esser Co. View |
Keuffel and Esser Log Log Duplex Decitrig 4081-3 10" Linear slide rule IN-2100 Keuffel & Esser Co. View |
Keuffel and Esser Polyphase Mannheim 4053-3 10" Linear slide rule stray114616 Keuffel & Esser Co. circa 1917 View |
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