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2. List of the United States Army fire control and sighting ...

   en.wikipedia.org/wiki/List_of_the_United_States...

   This is a list of United States Army fire control, and sighting material by supply catalog designation, or Standard Nomenclature List (SNL) group "F".The United States Army Ordnance Corps Supply Catalog used an alpha-numeric nomenclature system from about the mid-1920s to about 1958.

3. Periscope antenna - Wikipedia

   en.wikipedia.org/wiki/Periscope_antenna

   In telecommunications, a periscope antenna is an antenna configuration in which the transmitting antenna is oriented to produce a vertical radiation pattern, and a flat or off-axis parabolic reflector, mounted above the transmitting antenna, is used to direct the beam in a horizontal path toward the receiving antenna.

4. P-20 radar - Wikipedia

   en.wikipedia.org/wiki/P-20_radar

   The P-20 development was started in 1946 when State Federal Order of the Red Banner Research Institute Number 20 (now called All-Union Scientific Research Institute of Radio Engineering or VNIIRT [5]) was given the task of developing stationary and mobile early warning ground control and interception radar for the Soviet Air Force. [6]

5. Periscope - Wikipedia

   en.wikipedia.org/wiki/Periscope

   Principle of the periscope. The periscope on the left uses mirrors whereas the right uses prisms. a Mirrors b Prisms c Observer's eye Principle of the lens periscope. The two periscopes differ in the way they erect the image. The left one uses an erecting prism whereas the right uses an erecting lens and a second image plane. a Objective lens b ...

6. Honeywell Primus - Wikipedia

   en.wikipedia.org/wiki/Honeywell_Primus

   Honeywell Primus is a range of Electronic Flight Instrument System (EFIS) glass cockpits manufactured by Honeywell Aerospace. Each system is composed of multiple display units used as primary flight display and multi-function display .

7. Owner's manual - Wikipedia

   en.wikipedia.org/wiki/Owner's_manual

   If owners lose their car manual, they can either order a replacement from a dealer, pick up a used one secondhand, or download a PDF version of the manual online. [4] In 2017, IBM released IBM Watson Artificial Intelligence to understand and answer questions in natural driver language. [5] "Ask Mercedes" was the first in a wave of these vehicle ...