# Relationship history for MSHA mine 1514330

Current hierarchy: **Murray G Dale → Dolphin Energy Inc → Mary Mounts Coal Co**

- 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

- **controller_controls_mine:** Mounts Lester → Mary Mounts Coal Co; 1977-07-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Mary Mounts Coal Company Inc → Mary Mounts Coal Co; 1983-11-01 to 1995-09-14; source msha-controller-operator-history
- **controller_controls_operator:** Mounts Lester → Mary Mounts Coal Company Inc; 1983-11-01 to 1995-09-14; source msha-controller-operator-history
- **operator_operates_mine:** Dolphin Energy Inc → Mary Mounts Coal Co; 1995-09-15 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Murray G Dale → Mary Mounts Coal Co; 1995-09-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Murray G Dale → Dolphin Energy Inc; 1995-09-15 to current/open; source msha-controller-operator-history