Abstract: A vapor dispenser which comprises a reservoir to contain a nonflowing liquid whose vapor is to be dispensed into the environment and an outer covering about the reservoir which includes a membrane vapor-emitting surface through which the vapor is dispensed from the reservoir to the environment.

Abstract: A mechanical linkage and hydraulic circuit are used to control the position of a material handling element. A bell crank and outrigger arm are joined between the boom and dipperstick of a backhoe linkage and the supporting frame. A relief valve discharges fluid pressure building up in the actuator between the support frame and the boom. The bell crank linkage and hydraulic circuit maintains the position of the material handling element along the grade by manipulating the dipperstick alone.

Abstract: A straddle carrier for heavy loads of the type which is driven over a load so that the load is generally beneath the carrier and straddled by the wheels of the carrier. The carrier includes a main frame which has a gripping tong mechanism integrally mounted thereon for clamping the load. The entire main frame and tong assembly may be raised and lowered to permit handling the load by means of cylinder/strut arrangements at each of the four wheels. A pair of hydraulically actuated steering cross bars are pivotally connected to the front and rear wheels, respectively, in order to steer the straddle carrier. Mounted on the main frame, and like the main frame lowered and raised relative to the wheels, are an operator's cab and a motor and pump housing for driving the straddle carrier and actuating the various hydraulic cylinders of the carrier.