2001 - Volume #25, Issue #5, Page #37
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Pressure-Operated Farm Gate
Aircraft engineer Theo Stubbe invented this first-of-its-kind pressure-operated mechanism for opening farm gates.
  A "wire rope" runs from the gate post to a sunken pressure pad. The wheel of a vehicle û or a person walking û puts pressure on the pad, activating a mechanism in the post that rotates a lever at th..........


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2001 - Volume #25, Issue #5