slide rule patent
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Engineer's Slide Rule Patent 1922 – Patent Print, Wall Decor, Engineer Gift, Electrical Engineer, Measurement, Calculator, Engineers' Tools
$18.95 – $134.95 Select options -
Engineer's Slide Rule Patent T-Shirt 1922 – Old Patent T-shirt, Vintage Tools, Engineer Gift, Electrical Engineer, Engineer T-shirt
$21.95 – $25.95 Select options
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