# Relationship history for MSHA mine 1510974

Current hierarchy: **Bennett William O → W O Bennett Coal Company → Bennett Mine**

- 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:** Dobb Coal Company Inc → Bennett Mine; 1977-12-01 to 1978-08-24; source msha-controller-operator-history
- **controller_controls_mine:** Baldwin Eugene → Bennett Mine; 1977-12-01 to 1978-08-24; source msha-controller-operator-history
- **controller_controls_operator:** Baldwin Eugene → Dobb Coal Company Inc; 1977-12-01 to 1978-08-24; source msha-controller-operator-history
- **operator_operates_mine:** W O Bennett Coal Company → Bennett Mine; 1978-08-25 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Bennett William O → Bennett Mine; 1978-08-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bennett William O → W O Bennett Coal Company; 1978-08-25 to current/open; source msha-controller-operator-history