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SECO ELECTRONICS Inc. 1201 SOUTH CLOVER DRIVE - MINNEAPOLIS 20, MINNESOTA To: Owners of Models GCT-5, GCT-8, and GCT-9 Grid Circuit Testers New Tube Listings and set-up data - August, 1963 Information sheet # 563GL RECEIVING TUBE TYPES FOR MODEL GCT-9 Complements of: Randy.email@example.com Not to be sold.