| http://www.w3.org/ns/prov#value | - A43b 7/02 U.S. Cl. 12--142 5 Claims ABSTRACT OF THE DISCLOSURE A simple, economical device for generating heat which has particular utility when employed in articles of clothing, especially shoes, involves the provision of a sealed casing havin-g relatively at top and bottom members which serve to dene a closed cavity with a relatively small top to bottom dimension.
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