USSR KL-1 Circular Slide Rule w/Box Manual Mint Vintage Rare

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Gilson Slide Rule Company Model 401 Circular Slide Rule with case.

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Vintage Dietzgen Slide Rule 1769P Federal USA w/ Leather Case Engineering

VINTAGE CONCISE WHITE CIRCULAR SLIDE RULE NO 320 W/CASE

Vintage Pickett Model 20 Pocket Size Basic Slide Rule With Protective Case

1968 Sama & Etani Concise Science Tables & Circular Slide Rule 600, MOBIL OIL