| http://www.w3.org/ns/prov#value | - The combination, as defined in claim 12, wherein the code means on said cartridge comprises a web having a tactile discontinuity formed thereon, and said discriminator means is adapted to mesh with said discontinuity when a cartridge having a first code means corresponding to a selected type of test element is loaded in the support means and to abut against said web to prevent loading when a cartr
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