VINTAGE Accu-Math SLIDE RULE Model 400 w/ Carrying Case

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

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

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

NOS Accumath Slide Rule Mannheim Type Vintage w Case Instructions Complete

Vintage Slide Rule Keuffel & Esser K&E Mannheim N4041 w/ Orig Case

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

Vintage Mannheim Professional Slide Ruler ACU-MATH No 400 w/ Case USA