CPC Subgroup
F42C 11/02 with piezo-crystal
Full Title
Electric fuzes (; proximity fuzes F42C13/00; ; electric igniters F42C19/12, ) > with piezo-crystal
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F42C 11/02 Electric fuzes (; proximity fuzes F42C13/00; ; electric igniters F42C19/12, ) > with piezo-crystal