| http://www.w3.org/ns/prov#value | - Although cup-shaped filters having circular cross-sections are shown in FIGS. 7, 34, 35, 58, 59, 60, 61, 62 and 63, cup-shaped filters having other cross-sectional shapes such as oval, triangular, square, rectangular, pentagonal, hexagonal, octagonal, etc. may also be nested in each other.In one embodiment of the present invention, an OSL sensor may use only one cylindrical cup-shaped filter for t
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