| http://www.w3.org/ns/prov#value | - The blood leak detector in claim 10 wherein the first block and second block each further comprise a side wall on opposite sides of the slot, and each of said side walls has a recess aligned with the optical path, wherein each recess is an open region in the corresponding side wall providing a gap between the liquid transport tube and the sidewall such that the liquid transport tube is not flush a
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