A tachometer designed to operate by harmonic action of a reed(s).
NSN 5999-01-444-2091
NSN 5998-00-255-9069
NSN 5960-01-567-1096
NSN 6620-01-151-2288
NSN 5998-01-431-5787
NSN 5990-00-018-9723
NSN 6320-01-253-9585
NSN 5996-01-169-2278
NSN 5855-01-466-1588
NSN 5945-00-025-7843
NSN 5960-00-212-6367
NSN 2925-01-054-3190