1997 - Volume #21, Issue #6, Page #7
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Do-It-Yourself Driveway Alarm
"I put together a driveway warning system that works well for us to tell when anyone comes up the driveway," says Norman Kittleson, Sherburn, Minn.
"I took a pressure switch from a water pump system and reversed the action so that when pressure is applied on a water line, the electricity turns on instead of off. ..........


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1997 - Volume #21, Issue #6