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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. BASIC Stamp - Wikipedia

    en.wikipedia.org/wiki/BASIC_Stamp

    The BASIC Stamp is programmed in a variant of the BASIC language, called PBASIC. PBASIC incorporates common microcontroller functions, including PWM, serial communications, I²C and 1-Wire communications, communications with common LCD driver circuits, hobby servo pulse trains, pseudo-sine wave frequencies, and the ability to time an RC circuit which may be used to detect an analog value.

  6. Coins of the Indian rupee - Wikipedia

    en.wikipedia.org/wiki/Coins_of_the_Indian_rupee

    Metal Shape Diameter Minted in Year Obverse Reverse One Rupee: Singlemetallic Nickel Circular 27.9 mm 1950 - 1954 Half Rupee 24 mm 1950 - 1956 Quarter Rupee 19 mm 1950 - 1956 Two Annas Cupro-Nickel Square 25.4 mm 1950 - 1955 One Anna 12 Scalloped 21 mm 1950 - 1954 Half Anna Square 19.5 mm 1950 - 1955 One Pice Bronze Circular 21 mm 1950 - 1955

  7. Revenue stamps of the United Kingdom - Wikipedia

    en.wikipedia.org/wiki/Revenue_stamps_of_the...

    Therefore, the Penny Lilac was issued in July 1881 with the inscription Postage and Inland Revenue, superseding the older inland revenue stamps. [1] In 1883–84, a set of stamps known as the Lilac and Green Issue was introduced, and it bore the inscription Postage & Revenue. Later issues of postage stamps up to the 2/6 value also bore this ...

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