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Window envelope facts for kids

Kids Encyclopedia Facts
Stack of Envelopes by Martin Vorel
A few window envelopes.

The window envelope is an envelope with transparent plastic window in it so you can see what it is and who it's from. It was invented and patented by Americus Callahan in 1901. It was first called an "outlook envelope." Callahan planned to use very thin rice paper as the window, but now clear plastic is used.

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Window envelope Facts for Kids. Kiddle Encyclopedia.