Zeppo Marx (of the Marx Brothers) invented a wristwatch that sounded an alarm to warn about irregular heartbeat, and obtained two patents on it. This is from the book All My Best Friends, by George Burns.
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Zeppo Marx (of the Marx Brothers) invented a wristwatch that sounded an alarm to warn about irregular heartbeat, and obtained two patents on it. This is from the book All My Best Friends, by George Burns.