Model of 3- furrow mouldboard plough. "Sunlock" manufactured by H.V. McKay, Sunshine, Victoria, before 1928. Model made by H. V. McKay, Sunshine.

This type of plough was first made at the Sunshine Harvester Works in 1911. Made in 2-5 furrow sizes. The plough features adjustable furrow width, using a method invented by John Whitlock, an Australian, about 1907.

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