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  2. Circulator - Wikipedia

    en.wikipedia.org/wiki/Circulator

    ANSI and IEC standard schematic symbol for a circulator (with each waveguide or transmission line port drawn as a single line, rather than as a pair of conductors). In electrical engineering, a circulator is a passive, non-reciprocal three- or four-port device that only allows a microwave or radio-frequency (RF) signal to exit through the port directly after the one it entered.

  3. Sleeping pad - Wikipedia

    en.wikipedia.org/wiki/Sleeping_pad

    Approximate cost Common air mattress: 0.7: US$10 Common 10 mm (3/8 in) closed-cell foam pad: 1.4: US$10 Advanced foam pad: 3.5: US$40 25 mm (1 in) self-inflating mat: 3.4: US$70 Advanced air mattress: 6: US$200 Down-filled air mattress: 9: US$200 50 mm (2 in) folding DIY EPS foam [3] 10: US$15

  4. Air mattress - Wikipedia

    en.wikipedia.org/wiki/Air_mattress

    An air mattress as might be used for temporary guest accommodation. An air mattress is an inflatable mattress or sleeping pad.. Due to its buoyancy, it is also often used as a water toy or flotation device, and in some countries, including the UK and South Africa, is called a lilo ("Li-lo" being a specific trademark — derived from the phrase "lie low") or a Readybed.

  5. Duplexer - Wikipedia

    en.wikipedia.org/wiki/Duplexer

    A duplexer is an electronic device that allows bi-directional communication over a single path. In radar and radio communications systems, it isolates the receiver from the transmitter while permitting them to share a common antenna .

  6. Duplex (telecommunications) - Wikipedia

    en.wikipedia.org/wiki/Duplex_(telecommunications)

    A duplex communication system is a point-to-point system composed of two or more connected parties or devices that can communicate with one another in both directions. Duplex systems are employed in many communications networks, either to allow for simultaneous communication in both directions between two connected parties or to provide a reverse path for the monitoring and remote adjustment ...

  7. Mattress - Wikipedia

    en.wikipedia.org/wiki/Mattress

    Air mattress Air mattresses use one or more air chambers instead of springs to provide support. Quality and price can range from inexpensive ones used occasionally for camping, to high-end luxury beds. Air mattresses designed for typical bedroom use cost about the same as inner-spring mattresses with comparable features.