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In page Rotary dial:

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From as early as 1836 onward, various suggestions and inventions of dials for sending telegraph signals were reported. After the first commercial telephone exchange was installed in 1878, the need for an automated, user-controlled method of directing a telephone call became apparent. By 1891, numerous inventions were competing for acceptance and 26 patents for dials, push-buttons, and similar mechanisms, specified methods of signaling a destination telephone number. Most inventions involved costly, intricate mechanisms and required the user to perform complex operations.[citation needed]