Abstract: A cutter for cutting a detonating cord comprises a first jaw and a second jaw that are pivotable relative to each other. An anvil is mounted on the second jaw and has a first opening for receiving a cord and a second opening intersecting with the first opening. A blade is mounted on the second jaw and has a cutting edge that is arranged to slide into the second opening when the first and second jaws are pivoted toward each other.

Abstract: A perforating gun apparatus comprises a plurality of perforating gun, each gun containing at least one charge and a novel arming, testing and firing apparatus. The arming, testing and firing apparatus arms a first charge in a lowermost perforating gun; however, the arming of the first charge in the lowermost perforating gun allows a tester disposed at the well surface to determine the identity of the lowermost perforating gun to be detonated. Furthermore, the arming of the first charge in the lowermost perforating gun also enables the arming of a second charge in an adjacent perforating gun of the gun string. In the event the first charge is not armed as expected, the arming, testing and firing apparatus in the lowermost perforating gun bypasses the lowermost perforating gun and begins to arm the second charge in the adjacent perforating gun of the gun string.

Abstract: A safe-arm or quick arm system for a perforating gun includes a body containing a detonator and an adapter head containing an electrical plug and a detonating cord shell, the body and associated detonator being rotatable relative to the adapter head and associated detonating cord shell. Upon rotation of the body relative to the adapter head, the detonator moves from a start position to a transport position. In this position, the plug is not electrically connected to the detonator and the leads connected to the detonator are short circuited. The detonator is not adapted to receive electrical power. Upon further rotation of the body relative to the adapter head, the detonator moves from the transport position to an electrical contact position. In this position, the plug is electrically connected to the detonator but the detonator is not aligned with the detonating cord shell.

Abstract: A composition useful in the treatment of vitiligo, a method for preparing said composition and a method of treating vitiligo with said composition wherein said composition comprises a placental alpha lipoprotein component extracted from placental cotyledons.