Vintage Picket N-500-ES duplex aluminum linear slide rule. Features yellow ("eye saver") plastic coating and stamped aluminum contoured posts. Nylon cursor with convex lens. Front scales: +LL1, -LL1, A, D, DI, and K. Slide front scales: B, T, ST, S, and C. Marked: MODEL (/) N-500-ES (/) HI LOG/LOG. Pickett logo (1964-1975) and MADE IN U.S.A. Back scales: +LL2, -LL2, DF, D, +LL3, and -LL3. Slide back scales: CF, CIF, L, CI, and C. Marked with Pickett logo, ALL METAL (/) SLIDE RULES and ©1962.
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