Forensic Science: An Illustrated Dictionary
Any defect in typewriting resulting from the malfunctioning of the machine rather than the typebar or type element.
Normally, these defects include improper escapement spacing (that is, each letter under space or over space a fraction of the basic unit) and defects in printing brought about by improper alignment of the typing unit and the roller. In other words, machine defects tend to affect all the characters on the machine rather than any particular character.
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