prov:value
| - U.S. Pat. No. 7,309,513 to Brey et al., U.S. Pat. No. 5,696,199 to Senkus et al., U.S. Pat. No. 5,496,785 to Abler et al., and U.S. Pat. No. 5,078,132 to Braun et al., for example, describe various types of active particulate that could be used in connection with the present invention.
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