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http://www.google.sh/patents/US2638644?utm_source=gb-gplus-share
Patent US2638644 - AIR-CONDITIONING AND HUMIDDJYING
AIR-CONDITIONING AND HUMIDDJYING
John R. Rauhut et al
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Abstract
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Description
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Patent number
: 2638644
Filing date
: 25 Oct 1947
Issue date
: 19 May 1953
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