Abstract: A drop box for receiving mail pieces for collection and delivery by a postal service includes an enclosure having a slot sized for receiving mail pieces, a feeder positioned inside the drop box for engaging and conveying mail pieces inserted into the slot, a detector for detecting a potential contaminant inside the drop box, and a controller for initiating a preprogrammed action when a potential contaminant is detected inside the drop box. The preprogramed action may include locking the box and sounding an alarm coupled to the controller. The drop box may also be equipped with means for sterilizing the drop box and its contents such as a source of electromagnetic radiation and/or a source of a chemical sterilizing agent.

Abstract: A substrate support assembly 30 comprises a substrate support 38 and a collar 130 which may comprise at least one slit 150. The slit allows for thermal expansion compensation in the support assembly 30. The collar 130 may, for example, protect the dielectric 45 from erosion in a process chamber 25. In one version, the collar 130 comprises a clamping ring 200 on the dielectric 45.