From the case:
Joint types (illustrations)
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Types of joints. All image files licensed under Creative Commons BY 3.0 OpenStax College, cnx.org
Case Discussion
License: All image files licensed under Creative Commons BY 3.0
Author: OpenStax College, cnx.org
Original files: 1, 2, 3, 4, 5, 6, 7.
Images adapted for square crop by Dr Andrew Dixon.