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| buried via (A copper plated hole that interconnects one or more internal layers, but does not connect to an external layer, hence the hole is completely internal or buried within the board) | |||
| embedded via (Метран) | |||
| internal opening | |||
| central hole (напр., пильного диска) | |||
| внутреннее отверстие: 47 phrases in 15 subjects |