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 6145-01-620-5837
NSN 6220-00-660-5539
NSN 5930-00-985-4780
NSN 5965-01-367-7380
NSN 5910-01-352-1053
NSN 5855-00-361-0167
NSN 5950-01-649-1289
NSN 5950-01-044-1965
NSN 5930-01-464-0583
NSN 6240-00-845-9098
NSN 5920-01-573-0137
NSN 5945-01-624-8943