During his thirty year career, Lester Dent created several outstanding characters, starting with the immortal Doc Savage, but also including Black Mask's Oscar Sail, Genius Jones, and others. One of the most successful was the Gadget Man, who appeared exclusively in the pages of Street & Smith's Crime Busters magazine between 1937 and 1939. After Doc Savage, the Gadget Man was the longest running Lester Dent series. And, like Doc Savage, it was...