990Jones Derrick AAnimal training systemUS5287648 *Aug 1, 1990Feb 22, 1994Hand Herbert HElectrical support structure and method and apparatus for preventing crawling insects or other crawling pests from entering electrical devices mounted on support structures above groundUS5473836 *Nov 5, 1993Dec 12, 1995Liu; MichaelPest and insect expeller of an electromagnetic typeUS5632115 *Jun 9, 1995May 27,