| http://www.w3.org/ns/prov#value | - Aforesaid porous spreading layer includes the one wherein porous materials prepared in advance such as textile or the like for example are attached on the support and the one wherein a coating solution such as the one in which fibers are dispersed in nonaqueous solvent solution of binder is coated on the support and following method, for example, may be employed for causing freeze-dried products o
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