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  2. Radar beacon - Wikipedia

    en.wikipedia.org/wiki/Radar_beacon

    Radar beacon (short: racon) is – according to article 1.103 of the International Telecommunication Union's (ITU) ITU Radio Regulations (RR) [1] – defined as "A transmitter-receiver associated with a fixed navigational mark which, when triggered by a radar, automatically returns a distinctive signal which can appear on the display of the ...

  3. Sinclair Cambridge - Wikipedia

    en.wikipedia.org/wiki/Sinclair_Cambridge

    50 by 111 by 28 millimetres (2.0 in × 4.4 in × 1.1 in) The Sinclair Cambridge was a pocket-sized calculator introduced in August 1973 by Sinclair Radionics. It was available both in kit form to be assembled by the purchaser, or assembled prior to purchase. The range ultimately comprised seven models, the original "four-function" Cambridge ...

  4. TI-30 - Wikipedia

    en.wikipedia.org/wiki/TI-30

    The original TI-30. The TI-30 is a scientific calculator manufactured by Texas Instruments, the first model of which was introduced in 1976.While the original TI-30 was discontinued in 1983 after several design revisions, TI maintains the TI-30 designation as a branding for its low and mid-range scientific calculators.

  5. HP 48 series - Wikipedia

    en.wikipedia.org/wiki/HP_48_series

    Weight. 0.25 kg (0.55 lb) Dimensions. 17.9×7.9×2.8 cm (7.05×3.11×1.1 inch) The HP 48 is a series of graphing calculators designed and produced by Hewlett-Packard from 1990 until 2003. [1] The series includes the HP 48S, HP 48SX, HP 48G, HP 48GX, and HP 48G+, the G models being expanded and improved versions of the S models.

  6. 1,5-Diazabicyclo (4.3.0)non-5-ene - Wikipedia

    en.wikipedia.org/wiki/1,5-Diazabicyclo(4.3.0)non...

    Infobox references. 1,5-Diazabicyclo [4.3.0]non-5-ene (DBN) is a chemical compound with the formula C 7 H 12 N 2. [1] It is an amidine base used in organic synthesis. A related compound with related functions is 1,8-diazabicyclo [5.4.0]undec-7-ene (DBU). The relatively complex nature of the formal names for DBU and DBN (hence the common use of ...

  7. HP-34C - Wikipedia

    en.wikipedia.org/wiki/HP-34C

    The calculator was superseded, in 1982, by the HP-15C.. Although it is argued the HP-41C (introduced late 1979 and only a matter of months after the HP-34C) was a replacement for the HP-34C, they were in fact differentiated as much by price (the HP-34C being 50% that of the HP-41C) as by functionality and performance (the HP-41C being the first HP LCD-based and module-expandable calculator ...

  8. HP-65 - Wikipedia

    en.wikipedia.org/wiki/HP-65

    Dimensions. Length: 6.0 inches (150 mm), width: 3.2 inches (81 mm), height: 0.7–1.4 inches (18–36 mm) HP-65 in original hard case with manuals, software "Standard Pac" of magnetic cards, soft leather case, and charger. The HP-65 is the first magnetic card-programmable handheld calculator. Introduced by Hewlett-Packard in 1974 at an MSRP of ...

  9. HP-12C - Wikipedia

    en.wikipedia.org/wiki/HP-12C

    128 × 79 × 15 mm. The HP-12C is a financial calculator made by Hewlett-Packard (HP) and its successor HP Inc. as part of the HP Voyager series, introduced in 1981. It is HP's longest and best-selling product and is considered the de facto standard among financial professionals. There have been multiple revisions over the years, with newer ...