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  2. 2.5-millimeter band - Wikipedia

    en.wikipedia.org/wiki/2.5-millimeter_band

    The 2.5-millimeter or 122 GHz band is a portion of the EHF radio spectrum internationally allocated to amateur radio use between 122.250 GHz and 123.000 GHz. [1]The band is close to a molecular resonance of oxygen at 120 GHz, which causes significant atmospheric propagation losses, similar to that found at 60 GHz.

  3. List of military headstamps - Wikipedia

    en.wikipedia.org/wiki/List_of_military_headstamps

    The symbols on the lower arc of the stamp indicates the caliber (7.7mm, 5.56mm or 7.62mm) and R# or R#M# indicate the model (R) and mark (M) of the cartridge, like the Commonwealth L#A# stamp (e.g., R1M1 is the first model and second Mark of a cartridge). Later, the 2-digit year is in the 12 o'clock position and a digit in the 6 o'clock ...

  4. Sun Yat-sen stamps - Wikipedia

    en.wikipedia.org/wiki/Sun_Yat-sen_stamps

    On 1944-12-25 a set of five stamps was released for the 50th Anniversary of the founding in Hawaii on 1894-11-11 of Xingzhonghui (興中會), or Revive China Society, predecessor of the Kuomintang (Chinese Nationalist Party). The stamp was lithographed with rubber plates by the Central Trust Bureau in Chongqing, and issued without gum.

  5. Gauge block - Wikipedia

    en.wikipedia.org/wiki/Gauge_block

    Metric gauge block set, 112 pcs Another set with 8 pcs, 125 mm - 500 mm Trolley model. Gauge blocks (also known as gage blocks, Johansson gauges, slip gauges, or Jo blocks) are a system for producing precision lengths. The individual gauge block is a metal or ceramic block that has been precision ground and lapped to a specific thickness. Gauge ...

  6. Presidents of the United States on U.S. postage stamps

    en.wikipedia.org/wiki/Presidents_of_the_United...

    Grant (along with William T. Sherman and Philip H. Sheridan) appears on the 3-cent 1937 Army Issue commemorative stamp issue, one issue out of a set of five stamps among that issue. Grant also appears once in the AMERIPEX presidential series, 36 commemorative stamps, issued by the Post Office on May 22, 1986.

  7. Australia Post stamps and products - Wikipedia

    en.wikipedia.org/wiki/Australia_Post_Stamps_and...

    Soon after, the two atolls that comprise the islands started to appear on maps. These stamps show details of various Italian, French, Dutch and English maps over 400 years from the 17th to the 20th centuries. Each stamp is composed of various maps from a particular century: 17th, 18th, 19th and 20th. 100th Anniversary First Air Mail: 1 July 2014

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