until July 1864 that Napoleon III released a ruling for the framework for resolution which accepted the 1856 concession as a binding contract, ended the use of corvée labor, placed the land grants back into the hands of the Egyptian government, but called for remuneration of 84 million francs to the Suez Canal Company for violation of the labor and land agreements. Ismail received a loan from the Oppenheim brothers for nearly 100 million francs. Meanwhile, the progress of the canal construction proceeded slowly from 1863–1864. By February 1864, the corvée had finished the access canal from Lake Timsah to the Red Sea. After Napoleon III's decree in Summer of 1864, the use of corvée labor was restricted. The use of large mechanical dredging machines began to excavate the main canal. In December 1863, Voisin hired Paul Borel and Alexandre Lavalley's company, Borel, Lavalley, and Company, to design, build, and operate the dredging and excavation machines to finish the canal. Borel and Lavalley, like many of the engineers working on the project, were École Polytechnique alumni. These machines were powered by steam from coal in an era before the mass production of machines and machine tools. The men had prior railroad experience and Lavalley, in particular, had customised locomotives, designed lighthouses on the Black Sea, created a tunnel boring machine in Lithuania, and created a machine to dredge ports in Russia. Railroad tracks were laid along the canal route to accommodate some of the machines, whereas others were mounted on barges. The varying soil type necessitated more than a dozen different types of excavation machinery. Nearly 300 of these machines were used in this 5 year dredging period. Their subcontractor excavation price was determined on a price-per-unit basis – francs per cubic meter – which was further varied depending upon the soil type they excavated. Ultimately, Borel, Lavalley and company removed 75% of the 74 million cubic meters excavated from the main canal. And most of that work was done between 1867 and 1869. Another French contractor, Alphonse Couvreux, who is credited with the first documented use of a bucket chain excavator on land, employed seven of his excavators to dig about 8 million cubic yards of material from 1863 to 1868. During this same period, the jetties for Port Said were also constructed by the Dussaud brothers. They created two jetty structures, one at 1.5 miles in length, and