| http://www.w3.org/ns/prov#value | - It is preferable that this step is carried out in an atmosphere of an inert gas such as nitrogen and argon in order to prevent the iron powder from being oxidized by the contact with oxygen in the air during this step. [0295] The fourth step is a step of a placing a film-shaped or sheet-shaped covering member to cover the laminate of the sherbet-like heat-generating composition according to the pr
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