# Relationship history for MSHA mine 4607239

Current hierarchy: **Rackwood Mineral Holdings Plc → Royal Scot Minerals Inc → Cherry Knoll No 1 (1)**

- 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:** Sidusco Inc → Cherry Knoll No 1 (1); 1981-10-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Leckie Smokeless Coal Company → Cherry Knoll No 1 (1); 1986-12-01 to 1987-10-14; source msha-controller-operator-history
- **controller_controls_operator:** Sidusco Inc → Leckie Smokeless Coal Company; 1986-12-01 to 1987-10-14; source msha-controller-operator-history
- **operator_operates_mine:** Leckie Smokeless Coal Company → Cherry Knoll No 1 (1); 1987-10-15 to 1997-11-10; source msha-controller-operator-history
- **controller_controls_mine:** Joseph C  Turley III et al → Cherry Knoll No 1 (1); 1987-10-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Joseph C  Turley III et al → Leckie Smokeless Coal Company; 1987-10-15 to 1997-11-10; source msha-controller-operator-history
- **operator_operates_mine:** Royal Scot Minerals Inc → Cherry Knoll No 1 (1); 1997-11-11 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Rackwood Mineral Holdings Plc → Cherry Knoll No 1 (1); 1997-11-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Rackwood Mineral Holdings Plc → Royal Scot Minerals Inc; 1997-11-11 to current/open; source msha-controller-operator-history