The activity of supply and that of exploitation of the spare parts from the composition of the equipments that realize the preparation of the Jiu Valley coal influence its production costs. In this respect. this paper deals with. during some periods of time. https://www.diegojavierfares.com/amazing-price-Kicker-48CDF104-Comp-10-Down-Firing-Loaded-Subwoofer-Enclosure-special-find/