Ownership of the European-built Cupola observation module for the International Space Station (ISS) was officially transferred to NASA on 7 July 2005. The signature, which took place at the Kennedy Space Center in Florida marks the conclusion of ESA’s obligations for the Cupola’s development as part of a bilateral barter agreement between ESA and NASA.
More at:
http://www.esa.int/esaHS/SEMDK0808BE_index_0.html