Komatsu Ltd. was established in 1921 as a mining equipment producer and later expanded into agricultural machinery and military equipment. It became dominant in the Japanese construction equipment market with over 50% share. However, its market share declined after competitors like Caterpillar entered with partnerships. The case analysis documents Komatsu's evolution over decades under different presidents, as it struggled with competition but also diversified and grew its non-construction businesses through strategies like total quality control, expanding product lines, and establishing autonomous international bases. By the 1990s under Katada's leadership, non-construction sales accounted for 50% of Komatsu's business.