A medical device may include a tubular body configured to communicate gas and an inflatable cuff coupled to the tubular body at least by a collar. The additive is a compound represented by below formula :wherein R is defined as herein; n is 2, 3, or 4. A determination is made as to whether or not there is an acknowledgement from the back end storage regarding the receipt of the data associated with the IO request. It is preferred that a plurality of support posts and post clamps according to the invention be used with a molten metal pump wherein the top surface of each support post supports some of the weight of the superstructure. In one embodiment, the compute node may discover the other node using peer-to-peer platform protocols. The sheet post-processing apparatus includes the movable-table rotationally driving portion that rotates the movable table to cause the stapling unit to tilt at a position to drive the staple at the predetermined angle with respect to the sheet-conveying direction, and a tilt retention portion that mechanically holds the movable table to maintain the stapling unit tilted.