Abstract: A disposable stethoscope comprising a headset and a chestpiece assembly configured to be acoustically connected to the headset for conveying sound to the headset. The chestpiece assembly comprises a diaphragm, a chestpiece body, and a retention ring. The chestpiece body comprises a drum including a peripheral annular rim and a central hole. The diaphragm comprises a peripheral edge margin configured to be positioned on the drum such that the peripheral edge margin of the diaphragm is supported on the rim. The retention ring comprises a ring portion extending circumferentially about a ring axis and at least one latch arm extending along the ring axis. The retention ring is configured to be positioned on the chestpiece body to sandwich the peripheral edge margin of the diaphragm between the rim and the ring portion and the arms latch with the chestpiece body to attach the retention ring to the chestpiece body.

Abstract: A vehicle including a body, a plurality of wheels movably coupled to the body, a guidance control system. The plurality of wheels can be configured to roll through rows between plant beds such that at least a portion of the body moves above the plant beds. The guidance control system can be configured to guide the vehicle along the rows. The guidance control system can be configured to track a different individual plant location of each individual plant of plants that are either planned for growth or growing in the plant beds. Other embodiments are provided.

Abstract: A vehicle including a body, a plurality of wheels movably coupled to the body, a guidance control system. The plurality of wheels can be configured to roll through rows between plant beds such that at least a portion of the body moves above the plant beds. The guidance control system can be configured to guide the vehicle along the rows. The guidance control system can be configured to track a different individual plant location of each individual plant of plants that are either planned for growth or growing in the plant beds. Other embodiments are provided.

Abstract: A coating composition is provided for use in laminate substrates useful in packaging of liquids and solids where the coating provides and increased resistance to the permeability of gases such as oxygen and carbon dioxide. In one embodiment the coating composition is a dispersion or a solution that comprises at least one hydroxyl functional polyetheramine, phosphoric acid and a defoamer. The backbone of the polyetheramine has diglycidyl ether linkages that comprise about 5 to about 70 mole percent resorcinol diglycidyl ether. The coating composition can be applied to substrates by coating applications such as spraying, rolling reverse and direct, rolling direct and reverse gravure, kiss coat, flow coating, brushing, dipping and curtain-wall coating, for example.

Abstract: A discharge control system for a reservoir having a pressure-communicating valve in a valve chamber with the inlet of the pressure-communicating valve connected the reservoir outlet aperture and the outlet of the pressure-communicating valve connected to a discharge aperture in the containment structure for the valve chamber. An auxiliary reservoir outlet aperture enables water to flow from the reservoir into the valve chamber, submerging the pressure-communicating valve. Water flows from the valve chamber through a valve chamber outlet aperture that is substantially the same as the auxiliary reservoir outlet aperture and is located at substantially the same height as the center of the reservoir outlet aperture. One or more supplemental auxiliary reservoir outlet apertures are located at incrementally greater heights in the containment wall for said reservoir to assure that water will enter and leave the valve chamber at the same rate under all conditions.

Abstract: A frame structure comprises a plurality of parallel, spaced apart, arched frame assemblies composed of pairs of frames. This enables existing frame members to be used for longer spans and/or stronger structures. The pairs of frames are connected together at spaced apart positions. Conveniently the connections between frames occurs adjacent to the ends of sections forming the frames and a combined arrangement can be used for connecting frames and joining sections. Fabric panels extend between the frames of a pair and between pairs of frames. The panels have integral tensioning means. The frames are pivotally fastened to ground support means.

Abstract: A viewing structure comprising a plurality of parallel arched frames, pivotally mounted at their ends on the ground, each frame having a front portion, a top portion and a rear portion. The front portion is generally arcuate, with straight top and rear portions joined by a further arcuate portion. The top portion inclines upward and rearward and support pillars are mounted on each top portion, spaced apart along the top portion. Seating members are mounted on the pillars and flooring members are provided between the pillars. The spaces between arches can be filled by fabric panels. The clear space beneath the structure can be used for food concessions, washrooms and other uses.

Abstract: A frame supported structure with fabric panels is formed from a plurality of spaced arched frame members pivotally attached at their lower ends to ground plates. The ground plates are fixed in position prior to erection of the frames. The frames have open slots on each side into which slide beaded or roped edges of the fabric panels. The frames can be erected from or near ground level, and then the fabric panels pulled in along the slots, from ground level. Cranes or scaffolding are not required. After the panels are in position they are tensioned, as by inflating inflatable sections extending for the length of a panel.

Abstract: A buoyancy system for large scale underwater risers is provided, comprising a plurality of canisters. Each of the canisters extends partially around the circumference of a riser--usually, two canisters and the support structure surround a riser--and a plurality of canisters is associated with each riser section. Air is injected into the lowermost canister or canisters, at a pressure sufficient to displace the contained water within the canister; and when the water level within a canister is lowered sufficiently that a port in a cross connected tube is uncovered, the compressed air enters the tube and travels upwardly to the next canister above, where the unwatering sequence is repeated. Because very great depth can be accommodated--3,000 meters or more--provision is made for reflooding the canisters in the event of an emergency. Additionally, because of pneumatic considerations, different configurations of cross tube are provided for installation in the canisters at varying depths.