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Never drop the calculator or otherwise subject it to
strong impact.
Never twist or bend the calculator. Avoid carrying the
calculator in the pocket of your trousers or other
tight-fitting clothing where it might be subjected to
twisting or bending.
Never try to take the calculator apart.
Never press the keys of the calculator with a ball-point
pen or other pointed object.
Use a soft, dry cloth to clean the exterior of the unit. If
the calculator becomes very dirty, wipe it off with a cloth
moistened in a weak solution of water and a mild neutral
household detergent. Wring out all excess moisture
before wiping the calculator. Never use thinner, benzene
or other volatile agents to clean the calculator. Doing so
can remove printed markings and damage the case.
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