1851 Great Exhibition: Official Catalogue: Class IX.: Drummond and Sons
49. DRUMMOND and SONS, Stirling - Proprietors.
A grubber or cultivator, made by Mr. Lewis Potter, Bothkennar, near Stirling. The principal improvement consists in the easy adjustment of the tine frame, by means of lever and pulley.
A two-horse iron swing-plough, made by Mr. John Barrowman, of Saline, Fifeshire; with long handles and short beam.
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