File:OBrien-ADU-1 (47961565222).jpg
![File:OBrien-ADU-1 (47961565222).jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/f/fd/OBrien-ADU-1_%2847961565222%29.jpg/800px-OBrien-ADU-1_%2847961565222%29.jpg?20191215041755)
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