An item designed to count the number of ships passing over an underwater mine. It is set to allow detonation after a predetermined number of ships have passed.
Classification: Parts for bombs, grenades, torpedos, mines, and similar munitions of war
NSN 4140-01-044-6064
NSN 5910-00-800-8217
NSN 5998-00-679-4001
NSN 5935-01-054-3556
NSN 5835-00-198-4936
NSN 6685-01-029-9373
NSN 6145-01-165-7714
NSN 7035-00-371-7749
NSN 5835-01-100-3265
NSN 5975-01-258-9087
NSN 6620-01-038-1031
NSN 6320-00-564-2772