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 6240-00-079-1759
NSN 6135-01-168-2944
NSN 5985-01-612-5497
NSN 5835-01-354-0566
NSN 5945-01-300-7819
NSN 5855-01-620-4801
NSN 7035-00-076-4097
NSN 6320-01-082-2970
NSN 5975-01-577-4123
NSN 5945-01-436-0845
NSN 6685-01-627-0516
NSN 6240-01-550-1178