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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. Furthermore, the item must be somewhat bendable: see the USPS Domestic Mail ...

  3. History of United States postage rates - Wikipedia

    en.wikipedia.org/wiki/History_of_United_States...

    Third and Fourth Class Mail became Standard Mail (A) and (B) Special Fourth Class Mail was renamed Special Standard Mail; In 2007, First Class Mail was restructured to include variable pricing based on size, not just on weight. Shape-based postage pricing is a form of dimensional weight. Also, at that time, the International Parcel Post air ...

  4. Postage stamps and postal history of the United States

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

    The post-World War II stamp program followed a consistent pattern for many years: a steady stream of commemorative issues sold as single stamps at the first-class letter rate. While the majority of these were designed in the double-width format, an appreciable number issued in honor of individuals conformed instead to the format, size, general ...

  5. Engineering drawing - Wikipedia

    en.wikipedia.org/wiki/Engineering_drawing

    v. t. e. An engineering drawing is a type of technical drawing that is used to convey information about an object. A common use is to specify the geometry necessary for the construction of a component and is called a detail drawing. Usually, a number of drawings are necessary to completely specify even a simple component.

  6. Large-letter postcard - Wikipedia

    en.wikipedia.org/wiki/Large-letter_postcard

    Large-letter postcards were a style of postcards popular in North America in the first half of the 20th century, especially the 1930s through the 1950s. The cards are so-called because the name of a tourist destination was printed in three-dimensional block letters, each of which were inset with images of local landmarks. [1]

  7. List of battery sizes - Wikipedia

    en.wikipedia.org/wiki/List_of_battery_sizes

    A common size for cells inside cordless tool battery packs. This size is also used in radio-controlled scale vehicle battery packs and some Soviet multimeters. 1 ⁄ 2-, 4 ⁄ 5 - and 5 ⁄ 4-sub-C sizes (differing in length) are also available. Soviet 332 type can be replaced with R10 (#4, 927, BF, U8) or 1.5 V elements from 3 V 2xLR10 packs ...

  8. ANSI/ASME Y14.1 - Wikipedia

    en.wikipedia.org/wiki/ANSI/ASME_Y14.1

    A size chart illustrating the ANSI sizes. In 1992, the American National Standards Institute adopted ANSI/ASME Y14.1 Decimal Inch Drawing Sheet Size and Format, [1] which defined a regular series of paper sizes based upon the de facto standard 8 + 1 ⁄ 2 in × 11 in "letter" size to which it assigned the designation "ANSI A".

  9. Glossary of mathematical symbols - Wikipedia

    en.wikipedia.org/wiki/Glossary_of_mathematical...

    Equivalence class: given an equivalence relation, [] often denotes the equivalence class of the element x. 3. Integral part : if x is a real number , [ x ] {\displaystyle [x]} often denotes the integral part or truncation of x , that is, the integer obtained by removing all digits after the decimal mark .