The object of the invention consists of a process for the manufacture of aqueous suspensions of calcium carbonate using an acrylic polymer with an average by weight molecular weight of between 8,000 gmole and 15,000 gmole and a molar content of less than 20% of polymeric chains of molecular weight less than 3,000 gmole. A carriage is disclosed mounted to a track within a seat bottom for translating the seat back to the fore and aft positions. This can be used when calculating the synchronization of the UMTS timebase from the GSM network information. When 3-hydroxy-4-nitrobenzoic acid is used as a matrix, the matrix is preferably used as a mixed matrix in which \u03b1-cyano-4-hydroxycinnamic acid is combined. Unfortunately, typical diffusion barrier materials add appreciable resistance to the copper wiring, and thus negate some advantages of using copper. , ranging from 22 \u212b to 50 \u212b.