| http://www.w3.org/ns/prov#value | - After crank 15 has passed, the top and bottom flaps 528, 527 will return to the sealing position shown in FIG. 23. [0147] Persons skilled in the art should recognize that the flaps may have profiles other than the flat profiles shown in the figures, in order to increase their resiliency or to improve the seal. [0148] FIGS. 22-24 illustrate another embodiment of the slot seal mechanism, where like
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