1977 - Volume #1, Issue #3, Page #11
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Strip Door Keeps Heat In, Cold Out
New "see through" doors made of vinyl strips are catching on fast in factories, warehouses and other industrial buildings. They keep heated air in and cold air out to conserve energy. When you walk or drive through the strips, they automatically flop back into place to seal the opening.
Would they work on machine..........


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1977 - Volume #1, Issue #3