| http://www.w3.org/ns/prov#value | - FIGS. 8F and 8G are simplified top view of control devices 800??? and 800?????? that include four buttons 830 a-830 d, that may be configured to control scrolling along two axes, such as along the x- and y-axis, along the x- and z-axis, along the y- and z-axis or the like.
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