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ISO / IEC 7810 sizes. Most banking cards and ID cards. Size may also be referred to as CR-80 or TD1 . Older-style ID cards. Visas. All card sizes have a thickness of 760 ± 80 μm, i.e. minimum 0.68 millimetres (0.027 in) and maximum 0.84 millimetres (0.033 in). The standard defines both metric and imperial measurements, noting that: [ 4]
A Oscar Friedheim card cutting and scoring machine from 1889, capable of producing up to 100,000 visiting and business cards a day. Business cards are cards bearing business information about a company or individual. [ 1][ 2] They are shared during formal introductions as a convenience and a memory aid.
A 1951 USAF resolution test chart is a microscopic optical resolution test device originally defined by the U.S. Air Force MIL-STD-150A standard of 1951. The design provides numerous small target shapes exhibiting a stepped assortment of precise spatial frequency specimens. It is widely used in optical engineering laboratory work to analyze and ...
In the most familiar acuity test, a Snellen chart is placed at a standard distance: 6 metres. At this distance, the symbols on the line representing "normal" acuity subtend an angle of five minutes of arc, and the thickness of the lines and of the spaces between the lines subtends one minute of arc. This line, designated 6/6 (or 20/20), is the ...
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A foot-long sheet with the common width of Letter and (Government) Legal, i.e. 81⁄2 in × 12 in (215 mm × 305 mm), would have an aspect ratio very close to the square root of two as used by international paper sizes and would actually almost exactly match ISO RA4 (215 mm × 305 mm).
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