Antique Keuffel & Esser Thacher Cylindrical Slide Rule Engineering Calculator

Vtg (1950s?) Engineering Instruments Model 10 B 10” Slide Rule w/Booklet

Vintage Soviet Slide Rule LSLO 250-14P 1979 USSR w/ Case Moscow Original

Slide Rule - Engineering Instruments, Inc. 250-V w/case & instructions

1965 Acu-Math NO. 40 Slide Rule & Case Manual 12" - Engineering Mathematics USA

Lawrence Slide Rule 250-BT 1940s Vintage Engineering Instrument

Vtg Acu-Math No 130 Duplex Slide Rule, Engineering Mathematics USA - WORN

Vtg Engineering Instruments Inc 10" Slide Rule 250-V W/Box/Case/Instruction Book