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 6620-01-468-0362
NSN 6105-01-566-1293
NSN 5965-01-525-8992
NSN 5925-01-004-7609
NSN 5835-01-202-1376
NSN 6135-01-010-0891
NSN 5910-00-732-1301
NSN 5855-00-560-0110
NSN 2925-00-917-1987
NSN 5935-01-307-2525
NSN 6145-01-031-2081
NSN 6130-00-399-0729