A tachometer designed to operate by harmonic action of a reed(s).
NSN 5835-01-085-5487
NSN 6110-00-215-8585
NSN 5950-01-411-5615
NSN 5945-00-904-1894
NSN 6620-01-507-3276
NSN 5930-01-415-8004
NSN 5835-01-495-0595
NSN 5915-00-432-0645
NSN 6610-01-575-2406
NSN 5985-00-884-2190
NSN 5945-00-385-3683
NSN 4140-01-388-1304