Horticulture Industry

Horticulture Industry

4.11 - 1251 ratings - Source

One is to use rigid plastic sheet for the main structure and flexible sheet for the vents; the flexible sheet can be rolled up with a ... roller with manually operated handle (there was no reason why it should not have been motorised and automated). ... Minarelli at the Verona Show demonstrated a pipe bending machine that used tractor hydraulic flow on a single ram to ... by an electric motor which was reversed automatically by limit switches at each end of the house or any chosen point.

Title:Horticulture Industry
Publisher: - 1978


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