A filter monitoring device which detects variances in pressure of fluid flowing through a filter element in a filter assembly includes an indicator for conveying data of changes in the differential pressure of the fluid in the filter assembly and a temperature sensor for transmitting data showing any changes in temperature of the fluid being filtered. A customer anonymously interacts with the merchants to identify items to purchase, and the merchants provide virtual shopping carts including the item and tax information to the broker. The compounds have the general formula :wherein the symbols have the meanings given in the specification,and tautomers, stereoisomers and N-oxides thereof, as well as pharmacologically acceptable salts, hydrates and solvates of said compounds of formula and its tautomers, stereoisomers and N-oxides. A ratchet wheel defines a central bore tightly fit over the shaft whereby a friction is present between the ratchet wheel and the shaft. The rubber waste deformation unit includes a pair of cylindrical rollers having a plurality of protrusions projecting outwards, capable of sandwiching rubber waste at the gap therebetween, and a distance setting unit that can set the distance of the gap between the cylindrical rollers. The negative active mass includes a negative active material including a lithium vanadium composite oxide and a crystalline structure aid for inhibiting deterioration of a crystalline structure.