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 6320-01-422-1212
NSN 5925-00-547-7739
NSN 4140-00-640-6811
NSN 6130-01-253-2106
NSN 5965-00-529-0602
NSN 5990-01-419-0661
NSN 6135-01-439-8669
NSN 5985-01-027-9422
NSN 6135-01-552-1568
NSN 6320-01-458-9567
NSN 6105-00-224-2452
NSN 5855-01-180-5369