OCR-A
A font family tree displays different foundries’ versions, or a foundry’s different cuts, of basically the same typeface design.
| OCR-A |         
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| Adobe Font Family — 2 styles — from $29.00 |
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| OCR-A |
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| Bitstream Font Family — 1 style — from $24.75 |
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| OCR-A |    
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| URW++ Font Family — 1 style — from $19.95 |
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| OCR-A |
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| Elsner+Flake Font Family — 8 styles — from $35.00 |
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| OCR-A AI |
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| Apply Interactive Font Family — 12 styles — from $30.00 |
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| OCR One | 
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| ParaType Font Family — 1 style — from $25.00 |
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| OCR-A |
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| Linotype Font Family — 2 styles |
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| OCR-A |
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| Monotype Imaging Font Family — 2 styles |
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OCR-A
Some words from Adobe:
In 1968, American Type Founders produced OCR-A, one of the first optical character recognition typefaces to meet the criteria set by the U.S. Bureau of Standards. The design is simple so that it can be read by a machine, but it is slightly more difficult for the human eye to read.
OCR-A follows the 1981 standard set by the American National Standards Institute (ANSI), X-3.17-1981 (size I). The same design is also specified for the German DIN 66008 standard.
OCR-B was designed in 1968 by Adrian Frutiger for Monotype. This design pushes the limits of the optical reader, but is easier for people to read. OCR-B’s construction follows the ISO 1073/II-1976 (E) standard, with 1979 corrections (letterpress design, size I).
Both OCR-A and OCR-B have “alternate” versions, which have the standard ISO-Adobe character set instead of the more limited OCR character set.
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