As differentiated by serial no. 6610a4096a1
An instrument for measuring the rate of flow of a fluid through a pipeline. This measurement is indicated on a graduated scale either by means of a float confined in a tube, or pointer connected to a vane, or piston and spring or the like. Excludes meter, fluid flow indicating, differential pressure; meter, fluid flow indicating, electromagnetic; and meter, fluid flow indicating, ultrasonic.
NSN 5985-01-422-0534
NSN 5910-01-611-2493
NSN 2925-00-957-7329
NSN 5895-00-566-7529
NSN 6220-00-147-7064
NSN 5975-01-496-4937
NSN 5998-00-823-4999
NSN 5835-00-711-3371
NSN 2925-01-076-5219
NSN 7035-00-349-8571
NSN 5985-01-325-3327
NSN 6240-01-044-5049