Centuries: 18th century - 19th century - 20th century
Decades: 1830s 1840s 1850s 1860s 1870s - 1880s - 1890s 1900s 1910s 1920s 1930s
Years: 1881 1882 1883 1884 1885 - 1886 - 1887 1888 1889 1890 1891
... engineering[?] and aerospace engineering, and the operations are usually specialized, though might appropriately belong to operations research or systems ...
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