K+E Drafting Machine Protractor 24 inch axle center to axle center .  Good Working Condition . Cosmetically it shows it's 83 years of service . US pat number 2,377,429 issued between 1941 and 1942 . Must have been on a sunny drafting table for most of that time to fade the paint . There is Damage is to the indexing release (pictured) and the worn off paint from use , seen below it , and some superficial  rust .

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