Abstract: A collapsible portable corral for confining and directing the movement of livestock and the like. The corral has a front chute for providing an exit and entrance for livestock. A first and second front section are pivotally secured to the front chute, and a first and second intermediate section is respectively pivotally secured to the first and front section. A first and second rear section is respectively pivotally secured to the first and second intermediate section. Each of the first and second front sections is provided with a lever apparatus which is capable of raising or elevating a contiguous intermediate section relative to a front section and for holding the intermediate section in an elevated posture relative to the front section. Furthermore, each of the first and second intermediate sections has a similar lever device for elevating a contiguous rear section relative to the intermediate section and for holding the contiguous rear section in an elevated posture relative to the intermediate section.

Abstract: A one-piece shell for chairs made of a semi-rigid structural material. A plurality of parallel slots in the shell extend rearwardly from the seat section across the transition section and up the back section to form parallel ribs from the rear of the seat section into the back section. The ribs are corrugated to enable them to expand and twist individually to change the contours of the shell to accommodate different body shapes and movements.

Abstract: A proportional oven having two heaters mounted to a thermally conductive base stabilizes the temperature of a temperature sensitive crystal mounted on the thermally conductive base by adjusting the ratio of powers applied to the two heaters.