Many typefaces designed with a pen on paper (especially those from the 20th century) were licensed by different foundries, and were later independently digitized by them. Some special characters such as @ or the euro sign, were independently added later. Those “alternate cuts” are different digital versions of basically the same typeface design. They often vary in character set, letter proportions and kerning. Some are published under different names.
In 1968, Adrian Frutiger was commissioned to develop a signage system suited to the architecture of the new Charles de Gaulle Airport outside Paris. His final design for the client, implemented in 1975, is a simple, clean, robust sans serif type that is highly legible. In 1976, Frutiger completed the family for the Stempel foundry.