In contrast, a purely mechanical fuze ( usually triggered via a belleville spring ) gives a much longer operational life e . g . mines planted 50 years previously will still detonate if a target vehicle drives over them ."
2.
Digital computers would not be adopted for this purpose by the US until the mid-1970s; however, it must be emphasized that all analog anti-aircraft fire control systems had severe limitations, and even the USN Mk 37 system required nearly 1000 rounds of 5 " mechanical fuze ammunition per kill, even in late 1944.
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