Image: USPatent701839-CallahanAmericus-WindowedEnvelope
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Description: Technical drawing of a windowed envelope, United States Patent 701839, by Americus F. Callahan
Title: USPatent701839-CallahanAmericus-WindowedEnvelope
Credit: United States Patent and Trademark Office
Author: Americus F. Callahan
Usage Terms: Public domain
License: Public domain
Attribution Required?: No
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