| http://www.w3.org/ns/prov#value | - Since the case having the flat and inclined portions, the function data display means such as a liquid crystal display may be arranged in one of the flat and inclined portions, and the circuit operation means, as at least one of the circuit means, such as at least one pushbutton switch or a key pad with at least one switch for controlling the circuit means may be arranged in the other of the flat
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