£200
A rare Burt's Patent No 4359 March 1887-24" "British Customs Standard Cubing" Coggeshall type boxwood slide rule by HENRY HUGHES & Son London with Divisor Points for Calculating Solid Cubic Feet of Foreign Trees, Round Timber etc, Uneven Sided Timber & Stone of Every Description, Under Hoppus and Customs 1/4 Girt Line Systems G++
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