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  2. Stock market data systems - Wikipedia

    en.wikipedia.org/wiki/Stock_market_data_systems

    Jack Scantlin of Scantlin Electronics, Inc. (SEI) developed the Quotron I system, consisting of a magnetic tape storage unit that could be sited at a brokerage and Desk Units with a keyboard and printer. The storage unit recorded the data from the ticker line. Brokers could enter the stock symbol on a desk unit. This triggered a backward search ...

  3. Computer case screws - Wikipedia

    en.wikipedia.org/wiki/Computer_case_screws

    The #6-32 UNC screw has a thread pitch of 1/32 in (0.031250 inches (0.7938 mm)).. The #6-32 UNC is a UTS screw specifying a major thread diameter of #6 which is defined as 0.1380 inches (3.51 mm); and 32 tpi (threads per inch) which equates to a thread pitch of 0.031250 inches (0.7938 mm).

  4. List of screw drives - Wikipedia

    en.wikipedia.org/wiki/List_of_screw_drives

    The wall adapter has a molded screwdriver on its case to facilitate this. TP3 (sometimes referred to as tri-lobe or tri-lobular ) uses a Reuleaux triangle -shaped recess in the screw head, to make it semi-secure because it cannot be driven by a flat-blade screwdriver [ 89 ] and is not readily driven, as Tri-angle is, by hex keys.

  5. 19-inch rack - Wikipedia

    en.wikipedia.org/wiki/19-inch_rack

    A third common use for rack-mounted equipment is industrial power, control, and automation hardware. Typically, a piece of equipment being installed has a front panel height 1 ⁄ 32 inch (0.031 in; 0.79 mm) less than the allotted number of Us. Thus, a 1U rackmount computer is not 1.750 inches (44.5 mm) tall but is 1.719 inches (43.7 mm) tall.

  6. Screwdriver - Wikipedia

    en.wikipedia.org/wiki/Screwdriver

    A typical simple screwdriver has a handle and a shaft, ending in a tip the user puts into the screw head before turning the handle. This form of the screwdriver has been replaced in many workplaces and homes with a more modern and versatile tool, a power drill, as they are quicker, easier, and can also drill holes. The shaft is usually made of ...

  7. Programma 101 - Wikipedia

    en.wikipedia.org/wiki/Programma_101

    There are 10 memory registers: three for operations (M, A, R); two for storage (B, C); three for storage and/or program (assignable as needed: D, E, F); and two for program only (p1, p2). Each full register holds a 22-digit number with sign and decimal point or 24 instructions each consisting of a letter and a symbol. [ 11 ]