G21J   1/00		核爆発装置	Nuclear explosive devices	58
G21J   3/00		核爆発装置の平和利用	Peaceful applications of nuclear explosive devices	77
G21J   3/02	・	穴掘り用	for excavation	11
G21J   5/00		核爆発の探知装置	Detection arrangements for nuclear explosions	94
