Abstract: An ignition coil assembly having a coil spring (26) made of electrically conductive material, an electrical coil connected to deliver electrical energy from the ignition coil assembly 11 through the coil spring and a ferromagnetic member (30) disposed within the coil spring. A resistive spark plug (40) is electrically coupled to the coil spring (26). The spark plug and ferromagnetic member (30) form a high pass filter (51) and low pass filter (58) respectively to reduce radio frequency interference.

Abstract: An ignition coil assembly having a coil spring (26) made of electrically conductive material, an electrical coil connected to deliver electrical energy from the ignition coil assembly 11 through the coil spring and a ferromagnetic member (30) disposed within the coil spring. A resistive spark plug (40) is electrically coupled to the coil spring (26). The spark plug and ferromagnetic member (30) form a high pass filter (51) and low pass filter (58) respectively to reduce radio frequency interference.

Abstract: A ball-entrapping tennis net of the type that is comprised of two open meshworks that are each lined with strips of conventional netting is improved by bindings that hold the two meshworks together at both ends of the net.

Abstract: The invention relates to a meshwork made up of a plurality of horizontal and vertically extending strands defining a plurality of openings; the openings being of a size to allow a regulation tennis ball to pass therethrough. The meshwork is suspended in a parallel spaced relationship from a vertically extending wall surronding a tennis court; the wall being impervious to the passage of balls. Each of the openings of the meshwork being covered by a strip of material which is impervious to passage of a ball. The strip being attached at their upper end only, between the wall and the meshwork such that a ball will pass through the meshwork opening, rebound from the wall, deflect from the strips and come to rest on the ground between the meshwork and wall. Pivotal brackets are provided for supporting the meshwork in spaced relationship to the wall.

Abstract: A tennis net is disclosed that will confine the balls that hit it. The net comprises two open-spaced meshworks connected at their top edges, and overlapping strips of flexible netting or other barrier material fastened to hang free from the inside surfaces of each of the meshworks. The open spaces in the meshworks are dimensioned such that a standard tennis ball will pass through the meshworks when directed at the framework. As a ball passes through the meshwork it will be intercepted by one of the overlapping strips of flexible petting and fall to the tennis court between the two meshworks.