Neat! You can use Google's new patent search app, to find all sorts of things. Here's one that could be the very first patent for a Vibrator. It was filed all the way back in 1926, titled "Electric Therapeutic Appliance", and was filed by John Dequer of Los Angeles (California ... couldn't you guess).
The patent's also been referenced three times in the last twenty-odd years, as patent application titles became less and less creative. From the "Electric Therapeutic Appliance" to the "Mild-temperature thermomassage instrument" to "Apparatus for the threatment of diseases of the walls of opening or cavities of the body" to the most recent, and most straightforward, "Dildo"
Cool!