Random triples
| Subject | Object |
|---|---|
| gptkb:London_Underground_power_supply_system | direct current |
| gptkb:Edison_system | direct current |
| gptkb:Edison_Electric_Power_System | direct current |
| Subject | Object |
|---|---|
| gptkb:London_Underground_power_supply_system | direct current |
| gptkb:Edison_system | direct current |
| gptkb:Edison_Electric_Power_System | direct current |