Abstract: A game apparatus consisting of a housing with a game playing surface. A ball is rolled on the playing surface by a conventional shooting device. The playing surface has openings and the ball, propelled from the front towards the rear end, falls into one of the openings, enters into the interior of the housing and rolls back towards the front end. One opening towards the rear end is designated as a "functional" opening and the interior of the housing has electrical wiring and a switching device for starting and stopping a motor which rotates a multi-disc assembly whenever the ball falls into the "functional" opening.

Abstract: An apparatus wherein dust-laden gas is pumped into a housing having a plurality of tubular fabric filter bags. The gas flows through the bags to the interior of each tubular filter element and the solid particulates are deposited on the exterior surface of the fabric element. The clean gas from the interior of each filter element passes to the clean gas plenum via a thimble opening. Whenever one of the bags is ruptured, the gas velocity at the thimble opening increases dramatically due to the elimination of the resistance to gas flow by the fabric. A valve actuated by the sudden increase in gas velocity closes the thimble opening automatically and, thus, the contamination of the clean gas stream with solid particulates is prevented. The entire filtration apparatus is shut-down automatically by pressure control whenever, 25% or more of the fabric filter bags are ruptured and their thimble openings are closed by the respective valves.

Abstract: A game apparatus consisting of a housing with a generally triangular game playing surface. A ball is rolled on the playing surface either manually or by a conventional shooting device. The playing surface has openings and the ball, propelled from the front towards the rear end, falls into one of the openings, enters in the interior of the housing and rolls back towards the front end. One center rectangular opening in the rear end wall is designated as a "functional" opening and the interior of the housing has electrical wiring and a switching device for starting and stopping a motor which rotates an ornamental disc whenever the ball falls into the "functional" opening.