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  2. Flip chart - Wikipedia

    en.wikipedia.org/wiki/Flip_chart

    Flip charts have being in use from the 1900s, the earliest recorded use of a flip chart is a photo from 1912 of John Henry Patterson (1844-1922), NCR's CEO while addressing the 100 Point Club standing next to a pair of flip charts on casters. [4] The flipchart we know (on a small whiteboard) was invented by Peter Kent in the 1970s.

  3. Post-it note - Wikipedia

    en.wikipedia.org/wiki/Post-it_Note

    Website. www.post-it.com. A Post-it note (or sticky note) is a small piece of paper with a re-adherable strip of glue on its back, made for temporarily attaching notes to documents and other surfaces. A low- tack pressure-sensitive adhesive allows the notes to be easily attached, removed and even re-posted elsewhere without leaving residue.

  4. One-time pad - Wikipedia

    en.wikipedia.org/wiki/One-time_pad

    One-time pad. A format of one-time pad used by the U.S. National Security Agency, code named DIANA. The table on the right is an aid for converting between plaintext and ciphertext using the characters at left as the key. In cryptography, the one-time pad (OTP) is an encryption technique that cannot be cracked, but requires the use of a single ...

  5. Arthur Fry - Wikipedia

    en.wikipedia.org/wiki/Arthur_Fry

    Owatonna, Minnesota, U.S. Known for. Post-it Note creation. Arthur "Art" Fry (born August 19, 1931) [1] is an American inventor and scientist. He is credited as the co-creator of the Post-it Note (though this is disputed by some), an item of office stationery manufactured by 3M. As of 2006, Post-it products are sold in more than 100 countries.

  6. Telephone keypad - Wikipedia

    en.wikipedia.org/wiki/Telephone_keypad

    A telephone keypad using the ITU E.161 standard. A telephone keypad is a keypad installed on a push-button telephone or similar telecommunication device for dialing a telephone number. It was standardized when the dual-tone multi-frequency signaling (DTMF) system was developed in the Bell System in the United States in the 1960s – this ...

  7. Flip graph - Wikipedia

    en.wikipedia.org/wiki/Flip_graph

    The flip graphs of a quadrilateral (top-left), a pentagon (top-right), and a hexagon (bottom). Examples of flips in dimension 1 (top-right), 2 (top-left and central row), and 3 (bottom row). In mathematics, a flip graph is a graph whose vertices are combinatorial or geometric objects, and whose edges link two of these objects when they can be ...

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