Name Keuffel & Esser N < 4053 - 2 > S Polyphase Mannheim Adjustable, dated 1925
Front Scales 8inch / A = B CI C = D K ] 20cm
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 4104
Comment  
Thumbnail