Note 1: Stroke speed is usually expressed as a number of strokes per minute. When the system scans in both directions, the stroke speed is twice this number.
Note 2: In most conventional mechanical systems, the stroke speed is equivalent to drum speed[?].
Source: from Federal Standard 1037C and from MIL-STD-188
... Danewerk was a wall between 12 and 20 feet in height built by the Danes to protect themselves from the Franks. It was built between the 8th and 10th century AD and ...
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