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2. HP-67/97 - Wikipedia

   en.wikipedia.org/wiki/HP-67/97

   HP-97 calculator. In 1977, HP introduced an extended version of the desktop model as the HP-97S which featured an extra parallel I/O port (40 lines for 10 4-bit BCD digits, plus 5 control lines) for collecting data from external hardware, [ 6 ] at a price of $1,375.

3. Curta - Wikipedia

   en.wikipedia.org/wiki/Curta

   The Curta was conceived by Curt Herzstark in the 1930s in Vienna, Austria.By 1938, he had filed a key patent, covering his complemented stepped drum. [3] [4] This single drum replaced the multiple drums, typically around 10 or so, of contemporary calculators, and it enabled not only addition, but subtraction through nines complement math, essentially subtracting by adding.

4. Duck hepatitis virus - Wikipedia

   en.wikipedia.org/wiki/Duck_hepatitis_virus

   Duck hepatitis virus type 1 is classified as an enterovirus, DHV-2 is an astrovirus, and DHV-3 as a picornavirus. DHV-1 has the most significant economic effect due to its high mortality rate when the spread is not controlled. The virion of DHV-1 is a 20-40 nm diameter, non-enveloped, icosahedral particle.

5. HP-19C/-29C - Wikipedia

   en.wikipedia.org/wiki/HP-19C/-29C

   HP-19C calculator HP-29C with AC-powered battery charger. The HP-19C and HP-29C were scientific/engineering pocket calculators made by Hewlett-Packard between 1977 and 1979. They were the most advanced and last models of the "20" family (compare HP-25) and included Continuous Memory (battery-backed CMOS memory) as a standard feature.

6. Hewlett-Packard Voyager series - Wikipedia

   en.wikipedia.org/wiki/Hewlett-Packard_Voyager_series

   The 10C was a basic scientific programmable calculator. While a useful general purpose RPN calculator, the HP-11C offered twice as much for only a slight increase in price. Designed to be an introductory calculator, it was still costly compared to the competition, and many looking at an HP would just step up to the better HP-11C.

7. K factor (traffic engineering) - Wikipedia

   en.wikipedia.org/wiki/K_factor_(traffic_engineering)

   dhv= k*aadt in which DHV is the "Design Hourly Volume," the 30th highest hourly traffic volume (in both directions) in the year in which data was collected, by vehicles per hour. [ 4 ] DHV could also be the 50th or 100th highest hourly traffic volume (in both directions) in the year in which data was collected, by vehicles per hour; but one ...