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  2. Cable converter box - Wikipedia

    en.wikipedia.org/wiki/Cable_Converter_Box

    Pace Micro Technology DC757X HD cable box. A cable converter box or television converter box is an electronic tuning device that transposes/converts channels from a cable television service to an analog RF signal on a single channel, usually VHF channel 3 or 4, or to a different output for digital televisions such as HDMI.

  3. Mechanical television - Wikipedia

    en.wikipedia.org/wiki/Mechanical_television

    The reflected-light television system included both small and large viewing screens. The small receiver had a 2 by 2 + 1 ⁄ 2 inches (5 by 6 cm) screen, width by height. The large receiver had a screen 24 by 30 inches (60 by 75 cm), width by height. Both sets were capable of reproducing reasonably accurate, monochromatic moving images.

  4. Junction box - Wikipedia

    en.wikipedia.org/wiki/Junction_box

    A small metal, plastic or fiberglass junction box may form part of an electrical conduit or thermoplastic-sheathed cable (TPS) wiring system in a building. If designed for surface mounting, it is used mostly in ceilings, concrete or concealed behind an access panel—particularly in domestic or commercial buildings. [2]

  5. Overhead projector - Wikipedia

    en.wikipedia.org/wiki/Overhead_projector

    However some differences are necessitated by the much larger size of the transparencies used (generally the size of a printed page), and the requirement that the transparency be placed face up (and readable to the presenter). For the latter purpose, the projector includes a mirror just before or after the focusing lens to fold the optical ...

  6. Split-flap display - Wikipedia

    en.wikipedia.org/wiki/Split-flap_display

    The Signaltron main departure board at Praha-Smíchov station, Czech Republic (2012), manufactured by Pragotron Schematic of a split-flap display in a digital clock display An animation of how a split-flap display works Flap departure board at Gare du Nord, Paris (2007) Section of a split-flap display board at Frankfurt (Main) Hauptbahnhof (2005) Enlarged inner workings of a split-flap clock

  7. Flip-disc display - Wikipedia

    en.wikipedia.org/wiki/Flip-disc_display

    The flip-disc display (or flip-dot display) is an electromechanical dot matrix display technology used for large outdoor signs, normally those that will be exposed to direct sunlight. Flip-disc technology has been used for external destination signs on buses and trains across North America , Europe and Australia , as well as for variable ...