"The Missing Gas Mask"

Written by Jerry Siegel (writer), Maurice Kashuba (artist)

Published in Detective Comics #42, August, 1940, 6 pages.
The Secretary of the Department of Inventive Research visits the U.S. Secret Service headquarters and tells Bart Regan and his Chief that plans for a palm-sized gas mask have been stolen. Regan agrees to look for them. The real thief is a surprise.

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