Abstract: A duct stringer assembly with a bulkhead. The duct stringer assembly has duct walls providing a duct with a closed cross-section. The duct is adapted to transport fluid. A bulkhead is in the duct, and the bulkhead is adapted to block the flow of fluid along the duct. The bulkhead has a bulkhead body, and a gasket sealing a gap between the bulkhead body and the duct walls.

Abstract: A self-contained hand held mobile payment electronic device and method eliminates any use of cash or credit in making a payment from one party to another party who are both members of an association of parties, each party possessing one of the devices to execute a financial transactions between those parties. The devices all are capable of storing a credit balance deposited therein from a financial institution or other source of funds owned by the parties and transferring a payment from one party to another party of the association when the respective devices are positioned adjacent each other. A biometric sensor on each device enables transactions to be executed only when the paying party holds a finger or thumb on the biometric sensor which also indentifies the party.