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http://www.google.sh/patents/US3550159?utm_source=gb-gplus-share
Patent US3550159 - IMPACT-ABSORBENT CELLULAR STRUCTURE
IMPACT-ABSORBENT CELLULAR STRUCTURE
Eugenio Alarco et al
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Abstract
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Description
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Patent number
: 3550159
Filing date
: 10 Oct 1968
Issue date
: 1970
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