Name Keuffel & Esser < 4097 C > Ever - There, 1936 (Old 4098)
Front Scales A = B CI C = D K
Back Scales = S L T =
Type of Rule slide rule
Material Engine Divided White Xylonite
Dimension (mm) 153x33x3.5
Area of Use generic
Origin of Rule Michael O'Leary
Match Number 4373
Comment  
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