The invention relates to the collective fabrication of superposed microstructures, such as an integrated circuit and a protective cover. The fan assembly comprises a plurality of fan blades mounted about a central hub, and an annular ring member circumferentially coupled to the radially outboard end of each fan blade, coaxial with the central hub. The rest is mounted for movement in a passenger footwell on a pair of rails and a motorised pinion runs on a rack to move the rest up and down the rails. Inside the bracket is a removable pad having a \u201cC\u201d shape corresponding with the curved plate, the removable pad having a back surface comprising complimentary hook and loop fastening material cooperating with the first hook and loop fastener material to achieve a releasable attachment with the bracket. It is possible to temporarily position a solid energy emitting source in a reproducible manner at different locations within the inflated chamber, such that subsequent identical radiation treatment sessions can be performed, whereas the comfort of the patient is maxim and an out hospitalization treatment is possible. The ethanol injection suppresses knock so that higher compression ratio andor engine downsizing from increased turbocharging or supercharging can be used to increase the efficiency of the engine.