*VINTAGE* MANNHEIM ACU-MATH No. 511 Slide Rule. Made In The USA

Vintage Acu-Math No. 400 Slide Rule w/ Case & Instruction Manual

vintage Slide Rule: ACU MATH no 500 MANNHEIM in case,

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

Vintage Mannheim Type Acumath Slide Rule No. 400 With Case and Manual USA

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

Vintage Mannheim Professional Acu-Math No.311 Slide Rule & Case

Vintage Student Mannheim Trigonometry SLIDE RULE: ACU-MATH No 400 with Sleeve