| http://www.w3.org/ns/prov#value | - rresponding to FIGS. 1 a, 1 b and 1 c, respectively, illustrating a further probe constructed in accordance with the present invention including an optical sensor; while FIGS. 11 d and 11 e are plan and side views, respectively, more particularly illustrating the construction of the optical sensor; FIG. 12 is a block diagram illustrating apparatus constructed in accordance with the present inventi
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