Monotype and linotype typesetting machines were introduced in the late 19th century. It was released jointly by the Linotype, Monotype, and Stempel type foundries in 1967. Adobe, Monotype, Linotype and Bitstream have their own versions. Thus, the typefaces became part of the Adobe/Linotype PostScript typeface library. It became a standard design, with Monotype, Linotype, Ludlow and Intertype offering versions. In 1999, Zapf revised Palatino for Linotype and Microsoft, called Palatino Linotype. Linotype Univers Typewriter is a sub-family of fixed-width fonts under the Linotype Univers family. Carter designed many typefaces for Mergenthaler Linotype as well. Eras is licensed by the Linotype type foundry. It is currently available from the ITC and Linotype foundries. In 2008 it was the fifth best-selling typeface of the Linotype foundry. The font family includes all fonts previously released under the Linotype Univers title. The Arabic glyphs were based on a redesigned Yakout font family from Linotype. It is a variant of Linotype Syntax containing serifs. Various foundries have released versions, including Linotype, Elsner+Flake, URW++ and Mecanorma.