| http://www.w3.org/ns/prov#value | - An example of the former is set forth in the United States patent to A. A. Robbins et al, No. 2,925,719, wherein a refrigerating packet is provided containing an outer and inner envelope, with the inner envelope containing water and the outer envelope containing a refrigerating chemical, such as ammonium nitrate, for reaction with the water when the inner envelope is broken.
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