| http://www.w3.org/ns/prov#value | - Preferably a stop such as is illustrated schematically at 82 is provided which prevents the base from being folded in towards the scanner body any further than is shown in FIGS. 11D and 11E. In that position, there is a defined gap d between the front 76 of the scanner head and the front of the open window 80.
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