(57) A rotary printing device, such as a daisy-type printwheel (58), for use in an impact
printer, having identifying means thereon in the form of one or more protrusions (88),
extending outwardly from the printing device, the angle between the protrusions identifying
the print element characteristics and identifying the reference position of the printing
device for "arming" the printer with the information. In another form, a single protrusion
is provided solely for identifying the reference position.
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