| http://www.w3.org/ns/prov#value | - In this embodiment, since the bar code data which always accurately represents the bar code, irrespective of the kinds of bar codes, is stored in the register 23, by checking the bar code in the register 23 it is possible to easily check whether the left guard bar data LG, right guard bar data RG or center bar data CB has been stored in the register 23 or not.
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