In September 1969, ECMA started work to revise its published standard. The specification included a Letterpress design, intended for high-quality printing equipment and a rounded-edge Constant Strokewidth design for impact printers : 3 with reduced typographic quality. ![]() ![]() The first revision contained three font sizes: I, II and III. In February 1965, ECMA proposed a design for the “Class B” font to ISO, who adopted it as international standard ISO 1073-2 in October 1965. After evaluating existing OCR designs, it was decided to develop two new fonts: A stylized design with just digits, called “Class A” and a more conventional type design with broader character coverage, called “Class B”. ![]() In June 1961, the European Computer Manufacturers Association (ECMA) started standardization activities related to Optical Character Recognition (OCR).
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