# Relationship history for MSHA mine 4608025

Current hierarchy: **Rackwood Mineral Holdings Plc → Royal Scot Minerals Inc → Smokehouse North**

- 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:** Blankenship Darrell → Smokehouse North; 1990-08-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Cherry Knoll Mining Inc → Smokehouse North; 1991-04-01 to 1998-07-15; source msha-controller-operator-history
- **controller_controls_operator:** Blankenship Darrell → Cherry Knoll Mining Inc; 1991-04-01 to 1998-07-15; source msha-controller-operator-history
- **controller_controls_mine:** Rackwood Mineral Holdings Plc → Smokehouse North; 1997-11-11 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Royal Scot Minerals Inc → Smokehouse North; 1998-07-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Rackwood Mineral Holdings Plc → Royal Scot Minerals Inc; 1998-07-16 to current/open; source msha-controller-operator-history