| http://www.w3.org/ns/prov#value | - n depositing it in a reaction tube; - FIG. 2 is a side elevational view of the sampling head of the invention with portions broken away to show the details thereof, the head being shown in its two positions; FIG. 3 is a fragmentary top plan view of the head; FIG. 4 is a fragmentary sectional view taken along the line 44 of FIG. 2 and in the indicated direction; FIG. 5 is a fragmentary sectional vi
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