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Questions before ordering? Use this form to request more information from Bidbidman About K & E (Keuffel & Esser Co.) Slide Rule Manual Log Log Duplex Trig No. 68 2049 - Old No. 4187R.
Questions before ordering? Use this form to request more information from Bidbidman About K & E (Keuffel & Esser Co.) Slide Rule Manual Log Log Duplex Trig No. 68 2049 - Old No. 4187R.
Green/white/red paperback cover, staple-binding. Some very light tan spots and ink spots to page edges. Some cover fraying at top/bottom of spine, light cover edge wear. Otherwise clean, unmarked, low wear, binding tight.…