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My family donated an early model used by my Grandfather (Dean of Engineering @ U of Wyoming) and Uncle (Boeing Engineer) to the Engineering School at Colorado State University. They were floored w/ the opportunity to have one to have it for their archives. It came complete w/ magnifying glass and Manual. Last time I went to observe it there was an Engineering History Professor researching water rights/engineering topics from Nebraska-Kearney who had never seen a Thatcher. He was like a kid in a candy store.