This commercial item description covers single strike typewriter ribbons for general typing application.
Salient characteristics:
Ribbons shall consist of a continuous length of plastic film coated on one side with black imaging material with an uncoated film strip attached to the leading end.
The ribbons shall be firmly wound in cartridges or on spools or cores designed for operation with the machines specified. (see note).
Composition and application of the imaging material shall be such that it does not offset from one layer to the next and does not flake from the film.
The ribbon shall produce black impressions which are of uniform density, clean, legible, and sharp, without smears and smudges.
Workmanship. The plastic film shall be free from holes, tears, blisters; the miaging material shall be smoothly and evenly applied and of a uniform thickness; and the ribbons shall be free of defects such as pinholes, foreign matter, streaks, ot other imperfections which could adversely affect performance ans serviceability. In addition, ribbons shall be free from ragged or nicked edges, and the cartridges free of any defects which may affect serviceability.
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