#312 • Slide Rules with Cases and Portable Voice Recorder

Part of The Donna Bell Estate Auction - Abilene, KS (timed auction by Generations Real Estate & Auction, LLC)

Starting at $5.00

Status: Available

Bidding closes Nov 12, 2026 5:35 PM CST

Three slide rules and a portable voice recorder, including a Keuffel & Esser Co. duplex slide rule marked "<4092-3>", "PATS. 1,488,686 - 1,930,852", and "MADE IN U.S.A." with a tan leather case stamped "JULIUS W. BELL", a pocket slide rule with a brown leather slip sleeve marked "BERGER SCIENTIFIC SUPPLIES, Inc." and "DENMARK", a Discounted Cash Flow slide rule housed in a textured black folding case, and a portable voice recorder in a black stitched case with wrist strap and controls marked "RECORD", "OFF", "PLAYBACK", and "REWIND".

Slide Rules with Cases and Portable Voice Recorder