VINTAGE 1940's TRIANGULATOR SLIDE RULE MAKES TRIGONOMETRY EASY POCKET SIZE $9.95 USD Sold on: 2017-Oct-03 Marketplace: eBay ![]() 1 Treasure 0 Trash ![]() ![]() VINTAGE 1940's TRIANGULATOR SLIDE RULE MAKES TRIGONOMETRY EASY POCKET SIZE Click image to enlarge Description 9/17 A terrific collectible - A 1940s 'TRIANGULATOR' SLIDE RULE! 'MAKES TRIGONOMET... ![]() More Relevance Historical Items
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