An envelope for sending catalogs or discounts with another attached envelope, characterized by the fact that its back is usually on the front, adhered to one side or another of its surface a sheet pasted by its edges to this surface and provided a flap below which there is an opening through which the letter that may be attached to the documents contained in the envelope can be inserted, this opening being closed by the flap referred to, intended for its closing of gummed edges. (Machine-translation by Google Translate, not legally binding)
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