| J Series Drawings - 2M/3M Oxford Method Internal columns & casings | |
| J | 4 | 1010 | 4 | Internal column |
| J | 4 | 1020 | 4 | Internal column |
| J | 4 | 1030 | 3 | Internal expansion column (2) casing |
| J | 4 | 1040 | 3 | Internal expansion column (4) casing |
| J | 4 | 1060 | 3 | Internal corner column casing |
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