Abstract: A display device includes an enclosure for receiving a plurality of items of merchandise. The enclosure has a first side wall, a second side wall spaced apart from the first side wall and a front portion. The display device also includes a product advancing mechanism for advancing the items of merchandise toward the front portion of the enclosure for dispensing an item of merchandise. The product advancing mechanism includes a track disposed between the first and second side walls, a pusher body slidably engaging the track, a biasing element for biasing the pusher body, and a governing device for controlling the rate at which the first biasing element displaces the pusher body toward the front portion of the enclosure.

Abstract: A novel live vaccine for the prevention of salmonellosis in water fowl comprising essentially a suspension of living culture of the attenuated strain Salmonella typhi-murium No. 3, deposited at the All-Union State Research Control Institute for Veterinary Preparations, the USSR Ministry of Agriculture (No. 121), in a concentration of 2-4 billion microbe cells per 10 cm.sup.3 of drinking water. A process for making said vaccine, wherein the attenuated strain Salmonella typhi-murium No. 3 is cultivated in a culture medium containing sources of carbon, nitrogen, mineral salts, biologically active substances at a temperature of 37.degree.-38.degree. C. to produce the highest attainable accumulation of biomass during a period of 10-14 hours with subsequent drying and obtainment of the vaccine.