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Individual
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Individual
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Priority to ES92291UpriorityCriticalpatent/ES92291Y/en
Publication of ES92291UpublicationCriticalpatent/ES92291U/en
Application grantedgrantedCritical
Publication of ES92291YpublicationCriticalpatent/ES92291Y/en
New type of waterproof protective cardboard, characterized in that it is constituted essentially by a core of corrugated cardboard that on both sides and simultaneously in the act of forming it has mechanically adhered, two sheets of paper having their internal face tarred or asphalted, and whose sheets are pressed on the central body with which they form unity. (Machine-translation by Google Translate, not legally binding)
ES92291U1962-03-311962-03-31
Waterproof protective cardboard type
ExpiredES92291Y
(en)