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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. Mail - Wikipedia

    en.wikipedia.org/wiki/Mail

    Stamp collecting is commonly known as philately, although strictly the latter term refers to the study of stamps. Another form of collecting regards postcards , a document written on a single robust sheet of paper, usually decorated with photographic pictures or artistic drawings on one of the sides, and short messages on a small part of the ...

  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. 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 ...

  7. 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.

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