Some have suggested that it stems from Hussenot's device, because it used film and "ran continuously in a light-tight box, ...

“In the post-World War II field of electronic circuitry, black box became the ubiquitous term for a self-contained electronic device whose input and output were more defining than its internal ...

“In the post-World War II field of electronic circuitry, black box became the ubiquitous term for a self-contained electronic device whose input and output were more defining than its internal ...

“The truth is much more mundane,” the magazine wrote. “In the post-World War II field of electronic circuitry, black box became the ubiquitous term for a self-contained electronic device whose input ...