in exchange for synthetic material plants, ships, turrets, machine tools and coal. The agreement also contained a "Confidential Protocol" providing the Soviet Union would undertake purchases from third party countries of "metals and other goods" on behalf of Germany. The Soviets were to receive the incomplete heavy cruiser , the plans to the battleship , information on German naval testing, "complete machinery for a large destroyer", heavy naval guns, three twin turrets to defend ports, preliminary sketches for a 40.6 cm triple turret, working drawings for a 28 cm turret, other naval gear and samples of thirty of Germany's latest warplanes, including the Bf 109 fighter, Bf 110 fighter and Ju 88 bomber. Stalin believed the Lutzow to be important because of its new 20.3 cm naval guns, along with their performance characteristics. The Soviets would also receive oil and electric equipment, locomotives, turbines, generators, diesel engines, ships, machine tools and samples of German artillery, tanks, explosives, chemical-warfare equipment and other items. Expanded economic relationship Soviet provision of raw materials and other help Under the aegis of the economic agreements, Soviet-German exports and imports increased tenfold. While some slowdowns and negotiations occurred, the Soviet Union met all of its requirements under the agreement. It became a major supplier of vital materials to Germany, including petroleum, manganese, copper, nickel, chrome, platinum, lumber and grain. During the first period of the agreement (February 11, 1940, to February 11, 1941), Germany received: 139,500 tons of cotton 500,000 tons of iron ores 300,000 tons of scrap metal and pig iron Soviet goods were freighted to Brest-Litovsk, through occupied Polish territories and then shifted to European gauge track to Germany to circumvent the British naval blockade. The Soviets also granted Germany the right to transit for German traffic to and from Romania, Iran, Afghanistan and other countries in the east, while reducing by 50 per cent freight rates to Manchukuo, which was under Japanese control. Soviet exports to Germany, using German figures, which do not count products still in transit during Operation Barbarossa (which came in after June 1941), include: {| class=wikitable |- ! !!1939 ||1940 || 1941(1st 6 mos.)||||Soviet figures(September 1939 – 1941) |- style="text-align:center;" | align="left"|Oil Products||5.1 ||617.0||254.2||||941.7 |- style="text-align:center;" | align="left"|Grains||0.2 ||820.8 ||547.1||||1611.1 |- style="text-align:center;" | align="left"|Manganese ore||6.2 ||64.8 ||75.2||||165.2 |- style="text-align:center;" | align="left"|Phosphates||32.3 ||131.5 ||56.3||||202.2 |- style="text-align:center;" | align="left"|Technical oils & fats||4.4 ||11.0 ||8.9||||NA |- style="text-align:center;" | align="left"|Chromium||0.0 ||26.3 ||0.0||||23.4 |-