The card is sealed, and may itself constitute a practical device, such as a vane, shaker, stirrer, lever, pusher or sonicator for direct contact with a solid or immersion in {HEAD ~ a fluid}, or may be bonded by a stiff adhesive to make a surface to surface mechanical coupling with {TAIL ~ a solid workpiece}, device, substrate machine or sample 
The card is sealed , and may itself constitute a practical device , such as a vane , shaker , stirrer , lever , pusher or sonicator for direct contact with a solid or immersion in { HEAD ~ a fluid } , or may be bonded by a stiff adhesive to make a surface to surface mechanical coupling with { TAIL ~ a solid workpiece } , device , substrate machine or sample
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