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  2. Flats (USPS) - Wikipedia

    en.wikipedia.org/wiki/Flats_(USPS)

    To fit the definition a flat must: Have one dimension that is greater than 6-1/8 inches high OR 11-½ inches long (the side parallel to the address as read) OR ¼ inch thick. Be no more than 12 inches high x 15 inches long x ¾ inch thick. Weigh no more than 13 ounces.

  3. United States Postal Service - Wikipedia

    en.wikipedia.org/wiki/United_States_Postal_Service

    The full eagle logo, used in various versions from 1970 to 1993. The United States Postal Service (USPS), also known as the Post Office, U.S. Mail, or simply the Postal Service, is an independent agency of the executive branch of the United States federal government responsible for providing postal service in the United States, its insular areas and associated states.

  4. Arrow lock - Wikipedia

    en.wikipedia.org/wiki/Arrow_lock

    An arrow lock is metal and rectangular, measuring 2.005 in × 3.566 in × 0.620 in (50.9 mm × 90.6 mm × 15.7 mm) with a keyhole in the center. [2] When the user turns the key, a metal bar that normally protrudes from one side is moved through the lock to the other side.

  5. Envelope - Wikipedia

    en.wikipedia.org/wiki/Envelope

    An envelope is a common packaging item, usually made of thin, flat material. It is designed to contain a flat object, such as a letter or card. Traditional envelopes are made from sheets of paper cut to one of three shapes: a rhombus, a short-arm cross or a kite. These shapes allow the envelope structure to be made by folding the sheet sides ...

  6. Postage stamps and postal history of the United States

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

    Postal service in the United States began with the delivery of stampless letters whose cost was borne by the receiving person, later encompassed pre-paid letters carried by private mail carriers and provisional post offices, and culminated in a system of universal prepayment that required all letters to bear nationally issued adhesive postage stamps.

  7. Sectional center facility - Wikipedia

    en.wikipedia.org/wiki/Sectional_center_facility

    A sectional center facility (SCF) is a processing and distribution center (P&DC) of the United States Postal Service (USPS) that serves a designated geographical area defined by one or more three-digit ZIP Code prefixes.

  8. List of United States airmail stamps - Wikipedia

    en.wikipedia.org/wiki/List_of_United_States...

    Domestic air mail became obsolete in 1975, and international air mail [2] in 1995, when the USPS began transporting First Class mail by air on a routine basis. [ 3 ] [ 4 ] All post-1977 United States stamp images are copyright of USPS .

  9. Label 228 - Wikipedia

    en.wikipedia.org/wiki/Label_228

    Label 228 is available free of charge at all USPS Post Office locations or delivered by mail when ordered online. [1] Due to the widespread availability of Label 228, and the relatively large areas of blank space within the design, it has been widely used in sticker art and graffiti more commonly known as "slaps". Unlike many other stickers and ...