Random triples
| Subject | Object |
|---|---|
| gptkb:Siemens-Martin_open_hearth_process | late 19th century |
| gptkb:Siemens-Martin_open_hearth_process | 20th century |
| Subject | Object |
|---|---|
| gptkb:Siemens-Martin_open_hearth_process | late 19th century |
| gptkb:Siemens-Martin_open_hearth_process | 20th century |