# Relationship history for MSHA mine 3605893

Current hierarchy: **Costain Group PLC → Twin Oaks Coal Company → Twin Oaks Surface Mines**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Daset Mining Corp → Twin Oaks Surface Mines; 1975-10-15 to 1979-04-22; source msha-controller-operator-history
- **controller_controls_mine:** Darryl M  Jacobs → Twin Oaks Surface Mines; 1975-10-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Darryl M  Jacobs → Daset Mining Corp; 1975-10-15 to 1979-04-22; source msha-controller-operator-history
- **operator_operates_mine:** Twin Oaks Coal Company → Twin Oaks Surface Mines; 1979-04-23 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Costain Group PLC → Twin Oaks Surface Mines; 1979-04-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Costain Group PLC → Twin Oaks Coal Company; 1979-04-23 to current/open; source msha-controller-operator-history