A method, computer-readable medium, and a computing device are provided for associating one or more data objects and other information with one or more contacts. The device includes at a proximal portion a holder portion that is adapted to be fitted to a drill string engagement element of a rock drilling machine. The four-way fastener is situated at the corner diametrically opposed to the corner with the rigid faster, and the two-way fasteners are situated at one of the remaining corners each. The second link span has an average dispersion with a magnitude greater than zero. The transmit power of each WTRU’s downlink dedicated channel is adjusted to the minimum required power necessary and the PtM transmit power for each PtM group is set such that the PtM transmit power of a PtM group is equal to the greatest of a WTRU in the PtM group plus a PtM power offset. Suitable means prevent the water column in the one leg from pushing the series of tanks out of the U-tube.