4 digit counter; storage register; 0-1000 hz.;
No other part numbers with same form, fit, and function found.
A tachometer using solid state and/or vacuum tube circuitry.
NSN 5910-01-088-7957
NSN 2925-01-082-7248
NSN 5985-01-050-0604
NSN 6320-01-420-0340
NSN 5915-00-185-8610
NSN 2925-01-226-6126
NSN 5835-00-451-2982
NSN 5998-01-075-0311
NSN 6620-01-032-3937
NSN 6135-01-365-2707
NSN 5960-01-032-4229
NSN 5960-01-504-3415