| http://www.w3.org/ns/prov#value | - The apparatus as claimed in claim 2, wherein the fiber bundles embedded in the opaque material, the source of light, the means to receive the said element, and the plurality of phototransistors are disposed in a slotted portable container head of such size and configuration as to be held conveniently in one hand of an operator, the switching means is disposed operatively accessible to said hand of
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