Abstract: A pneumatic plug is used to seal off a pneumatic pressure source from a pneumatic pressure seed meter. The pneumatic plug comprises an annular rim defining an annular cavity, a insert portion and a sealing wall. The plug is an integral rubber body. The insert portion is inserted into a pneumatic hose supplying pneumatic pressure to the seed meter. The annular rim defines an annular cavity into which the pneumatic inlet of the seed meter is received. The annular cavity is provided with two inwardly extending sealing ridges that engage the outer sidewalls of the pneumatic inlet. The sealing wall provides a pneumatic seal for the pneumatic hose.

Abstract: A seeding machine is provided with a frame comprising a center frame section and left and right wing frame sections. The frame has a planting configuration and a transport configuration. The center frame section and the left and right wing frame sections each have a hollow toolbar forming a pneumatic manifold. Individual planting units are mounted to the toolbars. The pneumatic manifold of the center frame section is automatically pneumatically coupled to each of the left and right wing frame sections by a resilient bell that forms a pneumatic path between the center frame section and the left and right wing frame sections when the frame is in its planting configuration. The pneumatic manifolds are pneumatically coupled to pneumatic seed meters on the planting units by air hoses.

Abstract: A coal fired steam generating system including an auxiliary oil fired burner combined with an air heater. The air heater provides heated air that is adapted to heat and dry the coal for combustion, while hot products of combustion exhausting from the oil fired burner supply heat to a precipitator that raises its operating temperature to increase its collecting efficiency.