Warbird Information Exchange

(CNN)Their identities may have been lost in time, but now the search is on for two women who scrawled their names inside the wing of a WWII-era fighter plane.

A grease pencil signature says "Eva & Edith" and was found on a P-47 Thunderbolt by AirCorps Aviation, who is restoring the plane.

The specific plane, model P-47 D-23RA, that had the Eva & Edith signatures was completed in 1944 at Republic Aviation's Evansville, Indiana plant, according to the Aircorps website.

Thousands of women worked at the plant as part of the US war effort.