The Atlas Diesel merger experienced significant growth during the First World War and towards the end of the war, export dominated 40–50 % of production. The depression years caused significant losses for the company, which led to several financial reconstructions in the 1920s and 1930s. The economy began recovering, demand started growing again in the mid-1930s, and Atlas Diesel experienced a boom in sales, where compressed air operations was the most expansive area. The Second World War remained an active period for the firm and a time when strategic planning for development played a principal role. Manufacturing capabilities were embellished and the purchasing along with the acquisition of manufacturing subsidiaries in Sweden and other countries, was a key component to Atlas Diesel's continued growth after WWII. The "Swedish method" was another war period strategy that strongly influenced the firm's pneumatic program, consisting of lightweight rock drills and drill bits with carbide tips. In 1948 the company terminated its diesel manufacturing and the name "Atlas Diesel" was no longer pertinent. The name Atlas Copco became official in 1955 and was inspired by the Belgian subsidiary Compagnie Pneumatique Commerciale (Trading Pneumatic Company).