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The US Food and Drug Administration (FDA) defines soft contact lenses as: made of soft, flexible plastics that allow oxygen to pass through to the cornea. Soft contact lenses may be easier to adjust to and are more comfortable than rigid gas permeable lenses. Newer soft lens materials include silicone-hydrogels to provide more oxygen to your ...
An RC flyer demonstrating knife edge flying. A radio-controlled aircraft (often called RC aircraft or RC plane) is a small flying machine that is radio controlled by an operator on the ground using a hand-held radio transmitter. The transmitter continuously communicates with a receiver within the craft that sends signals to servomechanisms ...
Horizon Hobby, LLC is an American multinational hobby-grade RC radio control (RC) model, model train manufacturer, and distributor. It was founded by Rick Stephens, Janet Ottmers, Debra Love, and Eric Meyers, [1] in July 1985, [2] and headquartered in Champaign, Illinois. [3] Horizon Hobby products are sold in more than 50 countries. [4]
The first commercial use of CR-39 monomer (ADC) was to help create glass-reinforced plastic fuel tanks for the B-17 bomber aircraft in World War II, reducing the weight and increasing the range of the bomber. After the war, the Armorlite Lens Company in California is credited with manufacturing the first CR-39 eyeglass lenses in 1947.
This category contains only the following file. RC Lens logo.svg 275 × 364; 121 KB. Categories: Football clubs in Hauts-de-France. Lens, Pas-de-Calais. Sport in Pas-de-Calais. Hidden categories: Commons category link is on Wikidata. Wikipedia categories named after football clubs in France.
A Luneburg lens (original German Lüneburg lens) is a spherically symmetric gradient-index lens. A typical Luneburg lens's refractive index n decreases radially from the center to the outer surface. They can be made for use with electromagnetic radiation from visible light to radio waves. For certain index profiles, the lens will form perfect ...
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