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  2. Chart recorder - Wikipedia

    en.wikipedia.org/wiki/Chart_recorder

    Chart recorder. A chart recorder is an electromechanical device that records an electrical or mechanical input trend onto a piece of paper (the chart). Chart recorders may record several inputs using different color pens and may record onto strip charts or circular charts. Chart recorders may be entirely mechanical with clockwork mechanisms ...

  3. Piano roll - Wikipedia

    en.wikipedia.org/wiki/Piano_roll

    A piano roll is a music storage medium used to operate a player piano, piano player or reproducing piano. Piano rolls, like other music rolls, are continuous rolls of paper with holes punched into them. These perforations represent note control data. The roll moves over a reading system known as a tracker bar; the playing cycle for each musical ...

  4. Web notes - Wikipedia

    en.wikipedia.org/wiki/Web_notes

    Experimental press run. Estimated value. US$2 – $1,300. Obverse. Web notes are a type of United States currency named after the "web printing production" method of printing on continuous rolls of paper. There are several types of web printing production methods, including offset, gravure (intaglio), flexography, etc.

  5. Paper size - Wikipedia

    en.wikipedia.org/wiki/Paper_size

    Paper size standards govern the size of sheets of paper used as writing paper, stationery, cards, and for some printed documents. The ISO 216 standard, which includes the commonly used A4 size, is the international standard for paper size.

  6. Billboard charts - Wikipedia

    en.wikipedia.org/wiki/Billboard_charts

    The Billboard charts tabulate the relative weekly popularity of songs and albums in the United States and elsewhere. The results are published in Billboard magazine. Billboard biz, the online extension of the Billboard charts, provides additional weekly charts, [1] as well as year-end charts. [2] The two most important charts are the Billboard ...

  7. Graph paper - Wikipedia

    en.wikipedia.org/wiki/Graph_paper

    Graph paper, coordinate paper, grid paper, or squared paper is writing paper that is printed with fine lines making up a regular grid. The lines are often used as guides for plotting graphs of functions or experimental data and drawing curves. It is commonly found in mathematics and engineering education settings and in laboratory notebooks.

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