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 6135-01-056-4609
NSN 5990-01-548-3711
NSN 5975-00-905-5194
NSN 5990-01-054-3332
NSN 6110-00-525-3418
NSN 5985-01-240-7680
NSN 6150-01-521-3243
NSN 5925-01-592-2356
NSN 5905-01-589-6678
NSN 5915-00-481-9479
NSN 5990-01-345-1468
NSN 6685-00-972-9526