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Patrick Merryweather was a man who was trying to put a new type of robot into production prior to the Great War. The result of his efforts was the Drinkin' Buddy. He was able to create a successful prototype by using a heavily modified protectron, but was unable to deliver it before the bombs fell. The only evidence of his activites being on a terminal in the basement of The Shamrock Taphouse and Buddy stored in a charging station there as well. Patrick showed little regard for copyright law, using unauthorized homemade parts to modify a RobCo protectron and cracking a proprietary holotape from the Gwinnett Ale brewery and hoping their lawyers didn't catch wind before he made his ambitions a reality.
Patrick Merryweather is only mentioned in Fallout 4.