Name	Keuffel & Esser N < 4053 - 3F > Polyphase Mannheim Adjustable, dated 1925, 1927, 1928, 1930
Front Scales	10inch / A = B CI C = D K ] 25cm
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	4126
Comment
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