Guardian Multiphase Slide Rule for Checking Account Analysis

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Country of manufacture: USA,            Date of manufacture: ____
Overall length: 30.0 cm,          Width: 5.1 cm.           Weight: 243.8 gms.
Materials: All plastic body and slides.
Cursor: no cursor
Scales: 24, specialized
Front: RB 3½Y, RB 4Y [ BC-IU, BM-IC, B10M-IM, CL ] S-P, BM-I 1%
Slide 1 Back: BC-IU, BM-IC, B10M-IM, CL
Back: RB 4¼Y, RB 4½Y [ BC-IU, BM-IC, B10M-IM, CL ] S-P, BM-I 1%
Slide 2 Back: BC-IU, BM-IC, B10M-IM, CL
Condition: C3 (Very minimal signs of use)
Came with: Original black leather case, labeled, "The Guardian Multiphase Slide Rule".
Note: A description of the rule and instructions for its use may be found in U.S. Patent # 1, 978,038, October 23, 1934

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Front Face

Back of Slide on Front face

Back Face

Back of Slide on Back Face

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