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  2. Light switch - Wikipedia

    en.wikipedia.org/wiki/Light_switch

    3 Australian light switches and a "neon" indicator—in a 4-gang wall-plate. The lower switch is in the "on" or "down" position. Two Australian rocker switches (disassembled), together with a cutaway view, and a view of the switch connections An Australian architrave-mounted 2-gang switch plate and switches.

  3. Rocker cover - Wikipedia

    en.wikipedia.org/wiki/Rocker_cover

    A rocker cover, (UK), or valve cover (elsewhere) is a cover that encloses the rocker arm in an internal combustion engine, bolting with a gasket seal to the engine head. Engines with more than one head (such as a V8 ) will have multiple rocker covers.

  4. Beam tetrode - Wikipedia

    en.wikipedia.org/wiki/Beam_tetrode

    The beam confining plates are the silver coloured structures to the left and right Comparison of anode characteristic of beam power tube and power pentode Twin beam tetrode RCA-815, used as the bias oscillator tube in the Ampex Model 300 "bathtub" 1/4" full-track professional audio tape recorder Internal Construction of 4CX250B radial beam ...

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  6. Category:Nintendo Switch game covers - Wikipedia

    en.wikipedia.org/wiki/Category:Nintendo_Switch...

    To place a file in this category, add the tag {{Non-free game cover|Nintendo Switch}} to the bottom of the file's description page. If you are not sure which category a file belongs to, consult the file copyright tag page .

  7. Zone plate - Wikipedia

    en.wikipedia.org/wiki/Zone_plate

    Binary zone plate: The areas of each ring, both light and dark, are equal. Sinusoidal zone plate: This type has a single focal point. A zone plate is a device used to focus light or other things exhibiting wave character. [1] Unlike lenses or curved mirrors, zone plates use diffraction instead of refraction or reflection.