Vintage Mannheim ACU-MATH No. 400 Slide Ruler w/Original Sleeve. GUC PICS

Vintage ACU-MATH No. 400 Mannheim Slide Rule USA w/ Sleeve & Instructions

Vintage Mannheim Acu-Math No.400 Slide Rule w/Case

Vintage ~ Mannheim Type Slide Rule ~ Acu-Math No. 400 w/Case & Manual

Vtg Mannheim ACU-MATH [No. 400] 12.5" Slide Rule w/ Leather Sleeve - FREE SHIP

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

Vintage Acumath No. 400 Mannheim Slide Rule w/ Instructions and Case Made USA