# Relationship history for MSHA mine 4503643

Current hierarchy: **Richard  Dickson → Dickson Company → Plant II**

- 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:** Richard  Dickson et al → Plant II; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Dickson Company → Plant II; 2008-05-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Richard  Dickson et al → Dickson Company; 2008-05-13 to current/open; source msha-controller-operator-history