Name Keuffel & Esser N 4053 - 5 Polyphase Mannheim Adjustable, with molded plastic back
Front Scales 20inch / A = B CI C = D K \ 50cm
Back Scales = S L T =
Type of Rule slide rule
Material Engine divided celluloid laminated mahogany
Dimension (mm)  
Area of Use generic
Origin of Rule Michael O'Leary
Match Number 4138
Comment  
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