SUPERB VINTAGE KEUFFEL & ESSER CO. POLYPHASE DUPLEX SLIDE RULE ENGINEERING TOOL $39.77 USD Sold on: 2012-Dec-09 Marketplace: eBay 2 Treasure 0 Trash 100% Detail: VINTAGE SLIDE RULE KEUFFEL & ESSER COMPANY POLYPHASE DUPLEX SLIDE RULE IT IS 12 1/8" LONG THERE IS 3 PATENT DATES ON IT-JUNE 5,00-DEC 22,08-8.17.15 IT IS IN EXCELLENT CONDITION COMES WITH ORIGINAL... More Relevance Historical Items
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