The original Vertical Shaft Impactor. pcm_admin 04/01/2007, 12:00 am 685. The story of the Barmac VSI dates back to the late 1960s when New Zealander, Jim Macdonald, was promoted to the role of street works engineer for the Wellington City Council. This job involved taking charge of Kiwi Point Quarry, a run-down quarry where the established set ...
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