File:USPatent701839-CallahanAmericus-WindowedEnvelope.gif

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USPatent701839-CallahanAmericus-WindowedEnvelope.gif ‎(545 × 405 pixels, file size: 23 KB, MIME type: image/gif)

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current06:38, 6 May 2007Thumbnail for version as of 06:38, 6 May 2007545 × 405 (23 KB)commons>Thisisbossi{{Information| |Description= Technical drawing of a windowed envelope, United States Patent 701839, by Americus F. Callahan |Source= United States Patent and Trademark Office |Date= 1902-06-10 |Author= Americus F. Callahan }}

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