In 1975, the Greek government began a concerted effort to restore the Parthenon and other Acropolis structures. After some delay a Committee for the Conservation of the Acropolis Monuments was established in 1983.The project later attracted funding and technical assistance from the European Union. An archaeological committee thoroughly documented every artifact remaining on the site, and architects assisted with computer models to determine their original locations. Particularly important and fragile sculptures were transferred to the Acropolis Museum. A crane was installed for moving marble blocks; the crane was designed to fold away beneath the roofline when not in use. In some cases, prior re-construction was found to be incorrect. These were dismantled, and a careful process of restoration began.Originally, various blocks were held together by elongated iron H pins that were completely coated in lead, which protected the iron from corrosion. Since the corrosion product (rust).