| http://www.w3.org/ns/prov#value | - FIELD OF THE INVENTIONThe present invention relates to the field of closures for windows, doors, or other portals and, more particularly, to portal coverings utilizing magnetic fastening strips for magnetically sealing a non-sliding roll-up closure for a portal in a controlled environment.BACKGROUND OF THE INVENTIONRoll-up closures utilizing a flexible cover or curtain to cover a portal or opening
|
