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 6130-01-371-4571
NSN 6320-00-925-0558
NSN 6620-01-476-0498
NSN 6220-01-498-2800
NSN 6220-01-156-8247
NSN 5905-00-105-7769
NSN 5935-01-579-9841
NSN 5950-01-249-5930
NSN 6610-01-489-0071
NSN 5855-01-624-4467
NSN 6620-01-375-0211
NSN 5950-00-422-2250