SoundScriber

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The SoundScriber was a dictation format introduced in 1945. It recorded sound by pressing grooves into soft vinyl discs, and, along with the competing Gray Audograph and DictaBelt, is one of the few examples of a groove-based consumer recording medium.

The format remained popular for two decades, due in part to the robustness of the discs and the ease with which they could be mailed. The green discs with their characteristic square center hole came in two sizes, 6 inches (known as "Mail Chute") that played for 15 minutes, and 4-inch "Memo Discs" with eight minutes of recording time.

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