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Typical keycaps in the 1970s and 1980s were produced using two-shot molding, with the markings molded into each keycap in a different color of plastic.This eventually fell out of favor, as it was more expensive (particularly in tooling costs), and tended to produce keycaps more durable than the equipment on which they were mounted.
Thus, a 1U rackmount computer is not 1.750 inches (44.5 mm) tall but is 1.719 inches (43.7 mm) tall. If n is number of rack units, the ideal formula for panel height is h = 1.75 n − 0.031 for calculating in inches, and h = 44.45 n − 0.794 for calculating in millimeters.
Keycap in a French Model M. The Model M keyboard was designed to be less expensive to produce than the Model F keyboard it replaced. Principal design work was done at IBM in 1983–1984, drawing on a wide range of user feedback, ergonomic studies, and examination of competing products.