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Pregnancy Due Date Calculator at BabyCenter.com; Pregnancy Calendar and Due Date Calculator at American Pregnancy Association; OB Wheel: Pregnancy Calculator - Versatile pregnancy calculator that can be used offline. Available as a web app and Android app.
The pocket-sized Hewlett-Packard HP-35 scientific calculator was the first handheld device of its type, but it cost US$395 in 1972. This was justifiable for some engineering professionals, but too expensive for most students. Around 1974, lower-cost handheld electronic scientific calculators started to make slide rules largely obsolete.
Frank Stephen Baldwin (April 10, 1838 – April 8, 1925) was an American who invented a pinwheel calculator in 1875. He started the design of a new machine in 1905 and was able to finalize its design with the help of Jay R. Monroe who eventually bought the exclusive rights to the machine and started the Monroe Calculating Machine Company to manufacture it.
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In biology and medicine, gravidity and parity are the number of times a female has been pregnant (gravidity) and carried the pregnancies to a viable gestational age (parity). [1]
This word refers to a wedge-shaped block that's placed against a wheel to prevent it from moving. It's commonly used on larger vehicles. OK, that's it for hints—I don't want to totally give it ...
The calculator had spoked metal wheel dials, with the digit 0 through 9 displayed around the circumference of each wheel. To input a digit, the user placed a stylus in the corresponding space between the spokes and turned the dial until a metal stop at the bottom was reached, similar to the way the rotary dial of a telephone is used.
Friden made a calculator that also provided square roots, basically by doing division, but with added mechanism that automatically incremented the number in the keyboard in a systematic fashion. The last of the mechanical calculators were likely to have short-cut multiplication, and some ten-key, serial-entry types had decimal-point keys.
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