Abstract: The location of a mobile unit is determined by evaluating the instantaneous distances between an apparatus traveling above the surface of the earth and the mobile unit. The instantaneous distances are determined by measuring the travel time of a plurality of signals and calculating the distance based on the speed of the signal. One of two possible location regions is identified as the region including the location of the mobile unit by observing the motion of the mobile unit resulting from the rotation of the Earth.

Abstract: A disposal unit, for the disposal of dog waste, comprises a casing having an inlet slot in its upper wall, from which a chute leads downwardly within the casing to a bowl. An outlet conduit, incorporating a U-bend water trap, leads from the bowl out of the casing for connection to a sewage system. A flushing cistern is mounted within the casing and is operated by an external lever. In use, the dog waste is picked up in a scoop, placed in a disposable paper bag, and then deposited through the slot. It slides down into the bowl from where it may be flushed away by operation of the lever.

Abstract: A control valve having three motor passageways and a combination sequence and regeneration valve in a common housing, wherein the combination sequence and regeneration valve operates to prevent fluid communication between the third motor passageway and an inlet passageway when the pressure in the inlet passageway is below a first predetermined amount and permits bidirectional fluid communication between the third motor passageway and the inlet passageway when the pressure in the inlet passageway exceeds that predetermined amount.

Abstract: A hydraulic control system is provided, including first and second bidirectional fluid actuated motors adapted to travel a predetermined amount in each direction. A directional control valve is placed in fluid communication with a supply of high pressure, hydraulic fluid and a reservoir and has a first operating position for directing the supply of fluid to the motors in a first direction of flow and a second operating position for directing the supply of fluid to the motors in a direction of flow opposite to the first direction of flow. A combination sequence and regeneration valve is in continuous fluid communication with the supply and the second motor for preventing the operation of the second motor until the first motor has reached its limit of travel and for regenerating fluid from one side of the second motor to the other side when the first motor has reached its limit of travel and the control valve is in its second operating position.

Abstract: The hydraulic control valve assembly of the present invention functions to positively control the movement of a fluid powered motor unit, wherein the control valve comprises a manually slidable spool which allows hydraulic fluid to be selectively introduced into the fluid powered motor; the valve assembly further includes a piston stem-valve assembly which prevents actuation of the fluid motor in a specific direction unless the pressure in the load chamber of the fluid motor exceeds the pressure in the venting chamber by a predetermined amount.