Abstract: The disclosed hypodermic syringe includes a syringe barrel, a needle extending from the barrel, a movable safety sleeve surrounding the barrel, and a sleeve cap to cover the forward end of the sleeve. The syringe barrel includes a forward detent, an intermediate detent, and a rear detent, and the safety sleeve includes an inner ring for selective engagement with the detents. The safety sleeve is axially movable on the syringe barrel from an initial transport position on the intermediate detent, to a retracted position on the rear detent to expose the needle, and to a locked safety position on the forward detent. The sleeve cap is held on the safety sleeve by friction when the sleeve is in the transport position, and by positive engagement with the safety sleeve when the sleeve is in the locked safety position.

Abstract: A device for use in an electrophotographic printing machine which prevents magnetic particles moving with a photoconductive belt from contaminating processing stations located thereafter. A magnet is mounted on a support located before one of the processing stations. The magnet generates a magnetic flux field attracting magnetic particles moving with the photoconductive belt to prevent contamination of processing stations located thereafter.