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2. Radio spectrum scope - Wikipedia

   en.wikipedia.org/wiki/Radio_spectrum_scope

   A modern Elecraft P3 Panadapter RBY-1, US Navy Panoramic Radio Adapter RBY-1 with Hallicrafters SX-28.The Panoramic Radio Adapter is the upper part. The radio spectrum scope (also radio panoramic receiver, panoramic adapter, pan receiver, pan adapter, panadapter, panoramic radio spectroscope, panoramoscope, panalyzor and band scope) was invented by Marcel Wallace - and measures and shows the ...

3. Railway air brake - Wikipedia

   en.wikipedia.org/wiki/Railway_air_brake

   The mechanical linkage can become quite elaborate, as it evenly distributes force from one pressurized air cylinder to 8 or 12 wheels. The pressurized air comes from an air compressor in the locomotive and is sent from car to car by a train line made up of pipes beneath each car and hoses between cars. The principal problem with the straight ...

4. AOL Mail

   mail.aol.com

   Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!

5. Mechanical calculator - Wikipedia

   en.wikipedia.org/wiki/Mechanical_calculator

   For one cycle, they rotate 1/2, 1/4, and 1/12 of a revolution. . The 1/2-turn shaft carries (for each column) gears with 12, 14, 16, and 18 teeth, corresponding to digits 6, 7, 8, and 9. The 1/4-turn shaft carries (also, each column) gears with 12, 16, and 20 teeth, for 3, 4, and 5. Digits [1] and [2] are handled by 12 and 24-tooth gears on the ...

6. 1908 pattern webbing - Wikipedia

   en.wikipedia.org/wiki/1908_Pattern_Webbing

   The 1908 pattern web equipment was the main equipment with which the British and Imperial armies fought the First World War. [8] The inability of the Mills factory to keep up with demand led to the introduction of a leather version, the 1914 Pattern Leather Equipment , which was intended for training and second line troops, but often found its ...

7. TI-84 Plus series - Wikipedia

   en.wikipedia.org/wiki/TI-84_Plus_series

   The TI-84 Plus C Silver Edition was released in 2013 as the first Z80-based Texas Instruments graphing calculator with a color screen.It had a 320×240-pixel full-color screen, a modified version of the TI-84 Plus's 2.55MP operating system, a removable 1200 mAh rechargeable lithium-ion battery, and keystroke compatibility with existing math and programming tools. [6]