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