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from Etsy

Polyphase Slide Rule Keuffel & Esser Slide Ruler Antique Slide Rule Science Geek Gift Math Geek Nerd Gift Logarithms Math Gift Mathematic

Polyphase Slide Rule Keuffel & Esser Slide Ruler by KickassStyle, $40.00

from eBay

Keuffel Esser slide rule 4055 Mannheim with 4053-35 case Brown Sharpe calipers

Keuffel Esser slide rule 4055 Mannheim with case Brown Sharpe calipers