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  2. Postage stamp - Wikipedia

    en.wikipedia.org/wiki/Postage_stamp

    2. Perforations. 3. Denomination. 4. Country name. A postage stamp is a small piece of paper issued by a post office, postal administration, or other authorized vendors to customers who pay postage (the cost involved in moving, insuring, or registering mail). Then the stamp is affixed to the face or address-side of any item of mail —an ...

  3. List of British postage stamps - Wikipedia

    en.wikipedia.org/wiki/List_of_British_postage_stamps

    Low value definitives, 1873–80 (coloured corner letters) Low value definitives, halfpenny to 5d 1880–81. Penny Lilac 1881, the most issued Victorian stamp. High value definitives, 2/6 to £1 1883–84. Lilac and Green low value definitives 1883. Jubilee issue postage stamps 1887–92.

  4. Transformer types - Wikipedia

    en.wikipedia.org/wiki/Transformer_types

    The equivalent power rating of the autotransformer is lower than the actual load power rating. It is calculated by: load VA × (|Vin – Vout|)/Vin. [2] For example, an auto transformer that adapts a 1000 VA load rated at 120 volts to a 240 volt supply has an equivalent rating of at least: 1,000 VA (240 V – 120 V) / 240 V = 500 VA.

  5. History of United States postage rates - Wikipedia

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

    On September 25, 2013, the USPS announced a 3-cent increase in the First Class postal rate, effective January 26, 2014, increasing the price of a stamp to 49 cents. Bulk mail, periodicals, and package service rates were also increased by 6 percent. A loss of US$5 billion during the 2013 fiscal year was the reason given for the increase. [30]

  6. Utility frequency - Wikipedia

    en.wikipedia.org/wiki/Utility_frequency

    The waveform of 230 V and 50 Hz compared with 120 V and 60 Hz. The utility frequency, (power) line frequency (American English) or mains frequency (British English) is the nominal frequency of the oscillations of alternating current (AC) in a wide area synchronous grid transmitted from a power station to the end-user.

  7. List of Machin stamps - Wikipedia

    en.wikipedia.org/wiki/List_of_Machin_stamps

    NVI (or non-value indicator) Machins first appeared in 1989 in an attempt to negate the need to keep issuing new stamps after each postal rate change. They are marked 1st and 2nd for the two classes of post in the United Kingdom. The E NVI stamp represented the standard letter rate to Europe.

  8. Postage stamps and postal history of Albania - Wikipedia

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

    The Stamps and Posts of Albania and Epirus 1878 to 1945. Bristol: Stuart Rossiter Trust Fund, 2002 ISBN 0952717727 285p. Smaili, B. et al. Pulla Poste Shqipetare = Albanian Postage Stamps, 1913–1959. Tirana: Botuar nga Drejtoria e Pergjitheshme P. T. T. te Republikes Popullore te Shquiperise, 1959.

  9. United States Postal Service - Wikipedia

    en.wikipedia.org/wiki/United_States_Postal_Service

    The USPS calls these Forever Stamps but the generic name is non-denominated postage. Forever stamps are sold at the First-Class Mail postage rate at the time of purchase, but will always be valid for First-Class Mail, up to 1 ounce (28 g), no matter how rates rise in the future. [184] Britain has had a similar stamp since 1989.