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term:slide rules donor:Tyler Savard

2013.5.10
Keuffel & Esser model 1740 Thacher slide rule

2017.8.1
Sun Hemmi slide-rule

2018..3
Pickett Microline 140

2018.3.2
ALCO Personal Calculator

2018.9.1
Pickett Model N-500-T

2018.10.1
Unbranded Slide Rule.

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