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Switzerland relied on trade for half of its food and essentially all of its fuel but controlled vital trans-alpine rail tunnels between Germany and Italy. Switzerland's most important exports during the war were precision machine tools, watches, jewel bearings (used in bomb sights), electricity, and dairy products. Until 1936, the Swiss franc was the only remaining major freely convertible currency in the world,[38] and both the Allies and the Germans sold large amounts of gold to the Swiss National Bank. Between 1940 and 1945, the German Reichsbank sold 1.3 billion francs worth of gold to Swiss Banks in exchange for Swiss francs and other foreign currency, which were used to buy strategically important raw materials like tungsten and oil from neutral countries.[32] Hundreds of millions of francs worth of this gold was monetary gold plundered from the central banks of occupied countries. A total of 581,000 francs' worth of "Melmer" gold taken from Holocaust victims in eastern Europe was sold to Swiss banks.[32] In total, trade between Germany and Switzerland contributed about 0.5% to the German war effort and did not significantly lengthen the war.[32]