Actually there was a MR7 on the original NASA schedule for June 1960, but was cancelled somewhere along the way when the schedule apparently slipped some.
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Mike Rohde
NAR 89414
SAM 0114
NARtrek Silver
2015 motors  1/8A1, 1/2A20, A42, B55, C66, D11, E10 = 1469 n/s (200 flights)
2016 motors  1/8A1, 1/2A20, A39, B46, C56, D10, E7 = 1238 n/s (175 flights)
2017 motors  1/2A4, A26, B52, C47, D6, E7, F3 = 1238 n/s (138 flights)
2108 motors thru 1/20/18  A1, B1, C5, D1 = 69 n/s (8 flights)
