Abstract: The present invention device provides a device designed to prevent ear pain or discomfort due to air pressure changes when flying, comprising a head unit resembling a set of lightweight headphones, featuring an adjustable bridge that allows the unit to be worn by adults and children alike. The unique aspects of this product are found in its dual ear cover housings. Each circular covering features a comfortable, padded exterior to fit over the ears; directly behind the padding is a small section of empty space. Extending inward, an area of padded foam provides a blocking agent for air as well as noise. Further helping to protect the ears from changes in air pressure, each side of the Original Ear Popper Stopper is lined with bubble wrap, offering even more insulation.

Abstract: A railcar refrigerated by carbon dioxide snow has compartment at top for containing a supply of such snow. Openings are provided along each side and end wall for escape of carbon dioxide gas from compartment so it can flow down along each side of load and envelop same. Floor of car is formed with longitudinal channels with manifolds at ends of car to cause flow of gas toward one end along side walls and then through interior channels to discharge opening at opposite end.