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
... on Apollo 11: Sea of Tranquility, Luna, 4:18pm EDT. At 10:56pm EDT, Neil Armstrong is the first person to walk on the surface of the Moon.
1976 - Viking 1 lander ...
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