Name	Keuffel & Esser 68 - 1892 K-12 Prep, with transparent front opaque green plastic sheath (Picture page 2 case)
Front Scales	K A = B S CI T C = D L
Back Scales
Type of Rule	slide rule
Material	Vinylite laminations, Heat stamped
Dimension (mm)	311.5x41.5x3.2
Area of Use	generic
Origin of Rule	Miles Schumacher
Match Number	4767
Comment
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