TOKYO (AFX-ASIA) - Major export companies are revising the exchange rates on which they premise their business activities, betting on the further appreciation of the yen, now that the Japanese economy appears to have hit bottom and the economic outlook in the US has become uncertain, the Nihon Keizai Shimbun said, citing industry sources. It cited several companies as having revised their forex rate assumptions for the second half, including Honda Motor Co and Fuji Heavy Industries Ltd and major electronics manufacturers Fujitsu Ltd, Matsushita Electric Industrial Co and Mitsubishi Electric Corp. These companies are shifting their projected exchange rates to 120 yen to the dollar for the second half of the current business year, from 130 yen for the first half, it said.