Abstract: The present invention comprises a sheath for protecting a dental syringe and for preventing residual cross-contamination between successive patients. Means are provided for preventing contaminants from being drawn back into the syringe after application has ceased.

Abstract: This open support has the configuration of a "C" shaped sleeve (1) provided along the free ends of the "C" with two opposed lateral shapes (3) connected by weakened zones (2); each shape being provided with an inwards directed upper thin triangular projection (4) and a lower convex projection (5) so that during the assembly of the support (1) on the cable (6) the sleeve (1) is subjected to elastic strain and the shapes (3) begin to oscillate around the weakened zones (2) so that, due to an elastic thrust of the shapes (3) acting on the external lower semicircumference of the cable (6), the latter is pushed inwards and will snap into the sleeve (1) causing a further oscillation of the shapes (3) until they reach their end position while pushing the cable (6) inwards by boundary pressure.

Abstract: A dung removal conveyor (18, 20) for multi-deck poultry battery-nest installations with dropping plates arranged under the roost grates, including a single chain (12) centrally connected to scraper crosspieces (14) so as to allow limited movement therebetween, an oil pan (22), and oscillating plunger apparatus (27) for dipping into the oil pan and then extending to a position where oil carried thereby falls to lubricate the conveyor.