Abstract: A coupler system comprising: a coupler; first, second, and third bulkheads included in the coupler; an electrical switch included in the coupler, wherein the electrical switch includes a printed circuit board (PCB); wherein the first, second, and third bulkheads respectively include first, second, and third bulkhead electric contacts, and the first, second, and third bulkhead electric contacts include no resilient members; wherein: (a) the first bulkhead is to couple to a first proximal electrical contact of a proximal connector of a perforation gun, (b) the second bulkhead is to couple to a second proximal electrical contact of the proximal connector of the perforation gun, and (c) the third bulkhead is to couple to a distal electrical contact of a distal connector of another perforation gun. The coupler includes proximal and distal sacrificial blast plates.

Abstract: A perforation gun that includes a monolithic bulkhead electrical contact that includes no resilient members but that is resiliently coupled to two perforating guns. The bulkhead electrical contact is configured to transmit a signal across a bulkhead from one gun to another gun.

Abstract: A perforation gun that includes a monolithic bulkhead electrical contact that includes no resilient members but that is resiliently coupled to two perforating guns. The bulkhead electrical contact is configured to transmit a signal across a bulkhead from one gun to another gun.

Abstract: A perforation gun that includes a monolithic bulkhead electrical contact that includes no resilient members but that is resiliently coupled to two perforating guns. The bulkhead electrical contact is configured to transmit a signal across a bulkhead from one gun to another gun.

Abstract: A handheld device, such as a mobile phone, personal digital assistant (PDA), tablet computer, palmtop computer, or the like, can be protected from physical shock by being suspended within a multiple layer enclosure forming a protective case. The protective case includes an outer shell and an inner cushioning layer comprising one or more cushions. The cushions can be interlocked with opposing ends of the outer shell via an interlocking connection, so that the pieces of the cushion layer can be secured within the protective case. The cushions can cooperate to suspend the handheld device within the enclosure of the protective case and isolate the handheld device from the outer shell to protect the handheld device from physical shocks imparted to the outer shell.

Abstract: The display screen of a handheld device, such as a mobile phone, personal digital assistant (PDA), tablet computer, palmtop computer, or the like, can be protected from physical shock using a protective case with a sliding display screen cover. The protective case includes a main body having an opening positioned to correspond with a position of the display screen of the handheld device. A protective door, for example a roll-top type door, is slidably coupled to the main body, so that the display screen is exposed when the door has been slid open, and covered when the door has been slid closed. The door can be coupled to the body via a track, and can be made of a transparent or semitransparent material to allow viewing of the screen when closed, while still protecting the screen from physical shock.

Abstract: A handheld device, such as a mobile phone, personal digital assistant (PDA), tablet computer, palmtop computer, or the like, can be protected from physical shock by being suspended within a multiple layer enclosure forming a protective case. The protective case includes an outer shell and an inner cushioning layer comprising one or more cushions. The cushions can be interlocked with opposing ends of the outer shell via an interlocking connection, so that the pieces of the cushion layer can be secured within the protective case. The cushions can cooperate to suspend the handheld device within the enclosure of the protective case and isolate the handheld device from the outer shell to protect the handheld device from physical shocks imparted to the outer shell.