Which early product developer created the first working prototype of the cell phone but was overshadowed by Motorola when they released the first commercial model?

Many groundbreaking inventions that transformed product development had lesser-known contributors whose work was essential to their creation. Behind many famous products are stories of collaboration, disputed credit, and unsung heroes. Test your knowledge about these fascinating product development stories that changed our world but aren't always accurately represented in popular history.

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Dr. Henry Sampson, who invented the gamma-electric cell essential for mobile communication
Theodore Paraskevakos, who patented the concepts that evolved into the smartphone
Martin Cooper, who actually led Motorola's team and made the first public mobile call in 1973
Douglas Engelbart, whose early wireless communication device predated Motorola's work