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Most HP calculator front labels have one end that is slightly lifted. This was caused by the finger oil of whoever stuck it on affecting the glue over the years. If yours does not then mayby a hair dryer or razor knife can be used to lift one edge.
Once you have a free edge, then you can use a strong thread like to slide down under the label and slice through the adhesive. If you have a product called "UnDu" or UnDo (it is just the solvent heptane, also found in some rubber cement thinners) it helps to wet the thread with it. It will cause any adhesive to temporarily lose its stick. A hair dryer may also help.
The label will probably come off slightly curled. It can be straightened by placing it on a piece of paper release backing from an adhesive label, lating it on a smooth slightly resiliant surface and gently rubbing it, etc.