Here are the original Leslie Speaker drawings from the 1945 Patent Office. Leslie Speaker, Service Info Tweet Oiling Instructions for the Hammond Organ Hammond Patent Drawings Oiling Instructions for the Hammond Organ Hammond Patent Drawings Comments to “Leslie Patent Drawings” George Benton Dec 18th 2013 I totally agree. I wondered if these inventors hired artist to do their drawings. Reply Anne Lawrence Dec 18th 2013 These are some really sweet patent drawings! Does everyone draw things this detailed-ly when they invent something? I would hope they did. Reply Cancel Reply Name: Email: Website: Captcha: Comment: Notify me of follow-up comments by email. Notify me of new posts by email.