The technological changes that had made skilled Belgian workers so valuable, however, soon gave way to newer technologies that turned window-glass manufacture from a skilled craft to a mass-production industry. By the end of the 1920s, a few large corporations dominated the industry and machines replaced most of the skilled craftsmen. One exception, window-glass cutters, continued to provide opportunities to a new generation of Belgian-Americans. More than 70 years later, the Belgian-American Heritage Society keeps alive the history and culture of this fascinating ethnic group.