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A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding
Starmaster slide rule on ebay
From: Dave Walden
Date: 2019 Nov 25, 19:13 -0800
From: Dave Walden
Date: 2019 Nov 25, 19:13 -0800
A cos scale on a circular slide rule?
WWII STARMASTER CELESTIAL NAVIGATION CALCULATOR SPIRAL SLIDE RULE CO AVIATION