Non-volatile floating gate memory cells with polysilicon storage dots and fabrication methods thereof. A stabilizing structural member can support a chair or other patient support near shoulders of the patient, and the member may remain stationary while the chair is driven in a horizontal plane by a linkage. At least one shield is coupled to at least one of the base and the seal lip. It is a feature of the present invention that an external device can be used to retrofit such an installed base of devices for use with state of the art PoE functionality.