| BT20/2 External view 2 Pair terminal block. |
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| BT20/2 Internal view |
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| BT20/4 External view 4 Pair terminal block.
Ericsson Part N3191 |
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| BT20/4 Internal view |
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| BT20/8 External view 8 Pair terminal block. |
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| BT20/8 Internal view |
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| BT20/12 Internal view 12 Pair terminal block. |
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