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 6220-00-269-3783
NSN 6620-01-199-8580
NSN 6220-01-426-4177
NSN 6620-01-611-7907
NSN 5965-00-997-5764
NSN 5996-01-350-9771
NSN 6145-01-237-3496
NSN 6650-01-610-0010
NSN 6240-00-481-5776
NSN 6110-01-289-8170
NSN 6685-00-244-9943
NSN 5998-01-231-8461