Abstract: A dartboard scoring system for allowing players to keep score of a variety of dart games comprising a pegboard bearing indicia for dividing it into a plurality of team zones, each team zone bearing indicia dividing it into a matrix of scoring spaces, each scoring space bearing corresponding indicia indicative for scoring dart games, each scoring space further having a mounting hole formed thereon adapted for receiving a scoring marker; a chalkboard associated with the pegboard with the chalkboard adapted to be written upon with chalk for tallying and indicating a player's score during a dart game; and a plurality scoring markers, each securable in a mounting hole of the pegboard for indicating status of scoring during a dart game.

Abstract: An extension table is for use with a table saw which includes a table with discharge end and power saw. The extension table includes a base, a cylinder and a support assembly which supports the base. The base is a rectangular member which has a bottom surface with a rectangular slot on the bottom surface thereof and two arms. The cylinder is rotatingly coupled to the two arms by two screws. The support assembly has a support beam, a slidable support and an adjustable coupler. The support beam has a first elongated slot. The slidable support is an inverted Y-shaped member having a leg which is insertedly coupled into the rectangular slot of the base and two arms which are slidably coupled to the support beam. The adjustable coupler includes a coupling beam which has a second elongated slot, two chains and a board. The coupling beam is mechanically coupled to the table at its discharge end adjacent to the bottom thereof.

Abstract: A logic comparator circuit and system for testing the operation of an operating logic circuit installed a powered system against the operation of a known good, or reference, logic circuit of the same type or style. This is accomplished by applying the power, return and input signals of the operating logic circuit to the reference logic circuit and then comparing the corresponding output signals of each to detect improper operation. The present invention makes the interconnection of the two logic circuits to the logic comparator simple by only requiring that the user designate which terminals of the logic circuits are for power and return. The present logic circuit is provided with means for automatically discriminating between input and output terminals of the two logic circuits, and for clamping a free floating terminal of the operating logic circuit so that it may be detected repeatably.