# Relationship history for MSHA mine 1510342

Current hierarchy: **English Coal Company Inc → Pennyrile Coal Company Inc → Hamco Strip**

- 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:** Ham Ray A & John B → Hamco Strip; 1976-05-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Hamco Coal Company → Hamco Strip; 1977-04-01 to 1978-02-09; source msha-controller-operator-history
- **controller_controls_operator:** Ham Ray A & John B → Hamco Coal Company; 1977-04-01 to 1978-02-09; source msha-controller-operator-history
- **operator_operates_mine:** Pennyrile Coal Company Inc → Hamco Strip; 1978-02-10 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** English Coal Company Inc → Hamco Strip; 1978-02-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** English Coal Company Inc → Pennyrile Coal Company Inc; 1978-02-10 to current/open; source msha-controller-operator-history