The change in base metal stocks on the London Metal Exchange on October 21 was as follows: The copper stocks were reduced by 700 tons and the total stock was 84,025 tons. Aluminum inventories increased by 500 tons, with a total stock of 715,200 tons. Tin inventory decreased by 60 tons, with a total stock of 5,130 tons. Lead inventory decreased by 275 tons, with a total stock of 50,200 tons. Zinc stocks fell by 2,100 tons, with a total stock of 713,300 tons. Nickel inventory decreased by 30 tons, with a total stock of 15,156 tons. Aluminum alloy stocks remained flat with a total stock of 42,660 tons.