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Details
A boxwood slide-rule by Stanley,
Fredk. A. Sheppard Patentee, the fixed scales for Length/Superficial Area or Squares, with two slides for Breadth and Thickness - 13in. (33.5cm.) long
Fredk. A. Sheppard Patentee, the fixed scales for Length/Superficial Area or Squares, with two slides for Breadth and Thickness - 13in. (33.5cm.) long