Abstract: Ultrasound transducer comprising an array of electro-acoustic micro-cells, a first and a second group of transducer elements arranged substantially along two directions (x, y), each element being defined by a group of micro-cells of the array, at least part of the micro-cells of each group being electrically interconnected by a first connection pattern having shape with main orientation along one of the two directions (x, y), characterized in that each group of micro-cells defining each element comprises micro-cells interconnected by further connection pattern or patterns having shape with main orientation along the other of the two directions (y, x).

Abstract: Screeding apparatus includes an elongated support and a strike board extending from a carriage on the elongated support, the support moved by drive structure along spaced side forms. The carriage and strike board are moved relative to the elongated support to engage, move and compact wet concrete within a cavity between said side forms during formation of a concrete slab.

Abstract: A branch compactor for compacting branches, brush, small trees, and the like into a continuous bundle for compact disposal or input into a chipper device. The compactor includes a receiving bin and a coupled compactor mechanism, the bin has a bed conveyor for advancing loose branch material received in the bin toward the compactor mechanism. The compactor mechanism includes a pair of vertical entry rolls and a pair of horizontal secondary rolls arranged behind the entry rolls to define a constricted opening through which the branch material is drawn by projecting vanes on the contrarotated rolls.