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Individual
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Individual
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Priority to ES54887ApriorityCriticalpatent/ES54887A1/en
Publication of ES54887A1publicationCriticalpatent/ES54887A1/en
ES54887A1913-02-111913-02-11
A procedure that facilitates the opening of letter envelopes without the least damage to them or their content.
ExpiredES54887A1
(en)
New procedure to easily open all kinds of envelopes, without having to expose yourself to breaking the writing that it contains and without resorting to any tool.