Library shelf moving trolley. I'm not really sure how it's functioning without destroying the shelves, but the image is from a website of professional movers who specialize in library moving.
Fullsize image: https://s3-us-west-1.amazonaws.com/h...y_fullsize.jpg
https://s3-us-west-1.amazonaws.com/h...ng_trolley.jpg
More: http://www.hallettmovers.com/library-moving
Previously:
https://www.homemadetools.net/forum/...773#post140136
https://www.homemadetools.net/forum/...se-photo-75858
https://www.homemadetools.net/forum/...fs-photo-65356
https://www.homemadetools.net/forum/...hand-gif-72082
https://www.homemadetools.net/forum/...801#post108492