Why are some pans marked magnalite and others magnalite by Wagner?

The distinction between "Magnalite" and "Magnalite by Wagner" refers to different branding and ownership over the cookware. The original Magnalite cookware was developed by the Wagner Manufacturing Company, which began producing it in the 1940s. After Wagner was sold, the Magnalite brand continued under different ownership, leading to variations in labeling. Consequently, pans marked simply "Magnalite" may be from a different era or manufacturer, while those labeled "Magnalite by Wagner" are directly associated with the original company.