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Aristo Junior Overhead Projection linear slide rule

Major collection: Science & Technology
Object type: slide rule
Maker: Aristo
Place made: Germany
Materials: plastic; metal
Measurements: 1 1/2 in x 15 1/2 in x 8 1/2 in

Two sides of slide rule on single flat projection screen with warnings in several languages. No separate slide; only cursor is mobile. Scales: DF, CF, CIF, CI, C, D, A, K on top rule; no labeled scales on bottom rule. In bright yellow box.