HANS-ERICH AHRENS.

Mitchell attributes the funnel to Erich Ahrens, but Rosanoski distinguishes it from the separate company of that name because Mitchell identifies Martha Ahrens. No line drawing is given. The flag reference is derived from the funnel.

These leads agree with the local record but their underlying evidence could not be independently established. Wikipedia mirror is not counted as a second source. A738 flag is derived from a funnel, not a witnessed flag.