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At the turn of the Industrial Age and through the 1920s, some families could afford things such as electric trains, wind-up toys (typically boats or cars) and the increasingly valuable tin toy soldiers. Scale modeling as we know it today became popular shortly after World War II. Before 1946, children as well as adults were content in carving and shaping wooden replicas from block wood kits, often depicting enemy aircraft to help with identification in case of an invasion.[citation needed]