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2. Postage stamps and postal history of the United States

   en.wikipedia.org/wiki/Postage_stamps_and_postal...

   Benjamin Franklin — George Washington The First U.S. Postage Stamps, issued 1847. The first stamp issues were authorized by an act of Congress and approved on March 3, 1847. [20] The earliest known use of the Franklin 5¢ is July 7, 1847, while the earliest known use of the Washington 10¢ is July 2, 1847.

3. Postmark - Wikipedia

   en.wikipedia.org/wiki/Postmark

   Postmark. A postmark [1] is a postal marking made on an envelope, parcel, postcard or the like, indicating the place, date and time that the item was delivered into the care of a postal service, or sometimes indicating where and when received or in transit.

4. EWMA chart - Wikipedia

   en.wikipedia.org/wiki/EWMA_chart

   In statistical quality control, the EWMA chart (or exponentially weighted moving average chart) is a type of control chart used to monitor either variables or attributes-type data using the monitored business or industrial process 's entire history of output. [1] While other control charts treat rational subgroups of samples individually, the ...

5. Padded envelope - Wikipedia

   en.wikipedia.org/wiki/Padded_envelope

   Padded envelope. A padded envelope by Bubble Wrap. A padded envelope, also known as a padded or cushioned mailer, or jiffy bag in the United Kingdom, is an envelope incorporating protective padding to protect items during shipping. The padding is usually thick paper, bubble wrap, or foam.

6. AOL Mail

   mail.aol.com

   Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!

7. Slowly varying envelope approximation - Wikipedia

   en.wikipedia.org/wiki/Slowly_varying_envelope...

   In physics, slowly varying envelope approximation [1] ( SVEA, sometimes also called slowly varying asymmetric approximation or SVAA) is the assumption that the envelope of a forward-travelling wave pulse varies slowly in time and space compared to a period or wavelength. This requires the spectrum of the signal to be narrow-banded —hence it ...