Devices descending from K121889

2 later devices reach Staxx XD System through their predicates, nearest generation first.

Generation	Number	Device	Applicant	Decided	Own descendants	Recalls
+1	K133207	Staxx (R) System	Spine Wave, Inc.	2013	1	—
+2	K142996	StaXx (R) XD System	Spine Wave, Inc.	2015	0	—