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 6645-00-536-1555
NSN 4140-00-179-3977
NSN 7035-01-616-4945
NSN 6620-01-483-1138
NSN 5895-00-117-4257
NSN 6220-00-526-3421
NSN 5925-01-616-1280
NSN 6130-01-026-8381
NSN 6145-01-008-3166
NSN 6220-01-393-2335
NSN 5930-00-113-9313
NSN 4140-01-124-8904