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 soldering. Another type utilizes "pop rivets" for securing the strips, and
some are soldered in place. When the door closing action causes both wiping
and compression of the fingers, the oxides and foreign materials can be broken
through and good metal-to-metal contact made. Many of the knife edge type
closures do not provide sufficient compression and wiping to clean the contact
surfaces, and periodic maintenance with chemical cleaners is required. Strips
of exposed fingers require periodic replacement of broken or damaged strips.
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