On an inverter for feeding power of a direct voltage source, in particular of a photovoltaic generator, into an alternating voltage mains, with an asymmetrically clocked bridge circuit with at least two first switches clocked at mains frequency and with at least two second switches clocked at a higher clock frequency, the efficiency is intended to be improved at low cost. The seat belt anchor also includes an anchor base that supports both ends of the hanging shaft. 0% by weight of a water retention ratio and less than 0. The apparatus includes an envelope, and a sachet within the envelope that contains reactant, which generates a gas in the presence of an initiating agent, e. The elements can be assembled on a resilient structure to form an array.