With any kind of pillows, pilot results will not be accepted if damage occurred as follows:1. elastic structures of the knee was fractured, cracked, or warped;2. The surface of PTFE sheet tr ¬ spur off the pillow police send, cracked or deformed;3. closed Belt or other parts of the knee cracked, or warped;4. sheet metal sliding surfaces exposed to PTFE sheets of knee suffered scratches, abrasion.
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