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F. ROBSON & CO, Newcastle on Tyne
A boxwood shipbuilder's slide rule, stamped with scales for the determination of the weight of steel plates, further stamped Jarrow Docks-- 24¾in.(63cm.)long
A boxwood shipbuilder's slide rule, stamped with scales for the determination of the weight of steel plates, further stamped Jarrow Docks-- 24¾in.(63cm.)long