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  2. Optical disc - Wikipedia

    en.wikipedia.org/wiki/Optical_disc

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  3. All-dielectric self-supporting cable - Wikipedia

    en.wikipedia.org/wiki/All-dielectric_self...

    No metal wires are used in an ADSS cable. Optical fibers are either supported in loose buffer tubes, or arranged in a ribbon configuration. To prevent strain on the fibers, most types provide the fibres with excess slack length compared to the length of the supporting member.