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  2. List of soft contact lens materials - Wikipedia

    en.wikipedia.org/wiki/List_of_soft_contact_lens...

    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 ...

  3. Free-space optical communication - Wikipedia

    en.wikipedia.org/wiki/Free-space_optical...

    At the top right corner is a monocular for assisting the alignment of the two heads. Free-space optical communication ( FSO) is an optical communication technology that uses light propagating in free space to wirelessly transmit data for telecommunications or computer networking. "Free space" means air, outer space, vacuum, or something similar.

  4. Telescopic sight - Wikipedia

    en.wikipedia.org/wiki/Telescopic_sight

    A telescopic sight, commonly called a scope informally, is an optical sighting device based on a refracting telescope. [ 1] It is equipped with some form of a referencing pattern – known as a reticle – mounted in a focally appropriate position in its optical system to provide an accurate point of aim.

  5. Specification (technical standard) - Wikipedia

    en.wikipedia.org/wiki/Specification_(technical...

    Specification (technical standard) A specification often refers to a set of documented requirements to be satisfied by a material, design, product, or service. [ 1] A specification is often a type of technical standard . There are different types of technical or engineering specifications (specs), and the term is used differently in different ...

  6. List of Air Ministry specifications - Wikipedia

    en.wikipedia.org/wiki/List_of_Air_Ministry...

    List of Air Ministry specifications. This is a partial list of the British Air Ministry (AM) specifications for aircraft. A specification stemmed from an Operational Requirement, abbreviated "OR", describing what the aircraft would be used for. This in turn led to the specification itself, e.g. a two-engined fighter with four machine guns.

  7. Lists of airlines - Wikipedia

    en.wikipedia.org/wiki/Lists_of_airlines

    Lists of airlines. Lists of airlines cover existing and defunct airlines. Complete lists are given in alphabetical sequence by the name of the continent from which they operate. Lists are also given by size, by business model and by other characteristics. There are over 5,000 airlines with ICAO codes .

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