Acu-math Simplex Trig Slide Rule No. 500 (ca. 1960)

ACU-MATH No. 500 Slide Rule w/ Original Sheath Acumath

Vintage 1960 Acumath Acu-Math Slide Rule No. 150 W/ Box & All Paperwork- EX Cond

Vintage Slide Rule Mannheim Acu-Math No. 500 With Original Sheath Acumath

Vintage Acumath Engraved Slide Rule Acu-Math Rule Co. W/Original Box Manual

Acumath Engraved Slide Rule. Plastic. Made In USA with Original Case Vintage

Vintage Slide Rule Mannheim Acu-Math No. 500 With Original Sheath Acumath

Vintage Slide Rule Mannheim Acu-Math No. 400 w Original Sheath Acumath Calc Trig