The sans serif Angro was designed in the weights light and bold by Erwin Koch, who was also created the typeface Monanti. The figures are based on the form of a rectangle, which along with the high x-height and short ascenders and descenders gives the forms a static character. Lines of text in Angro are very compact and close set. Due to the reserved ascenders and descenders, Angro can be set with very close line spacing. Angro was initially designed to be used with the typesetting equipment produced by the German company Dr.-Ing Rudolf Hell GmbH.
In 1990, Linotype AG merged with Dr.-Ing Rudolf Hell GmbH, forming the Linotype-Hell AG (today Linotype GmbH). Since then, Linotype has been the official source of all fonts that were originally designed for the Hell Corporation. Linotype has also improved the typefaces using new technologies, including OpenType."