# Relationship history for MSHA mine 4606545

Current hierarchy: **Harper Dale → Copper Valley Mining Inc → No 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

- **operator_operates_mine:** Wren Coal Company → No 1; 1982-06-01 to 1983-09-13; source msha-controller-operator-history
- **controller_controls_mine:** Ellison Russell → No 1; 1982-06-01 to 1984-05-07; source msha-controller-operator-history
- **controller_controls_operator:** Ellison Russell → Wren Coal Company; 1982-06-01 to 1983-09-13; source msha-controller-operator-history
- **operator_operates_mine:** Copper Valley Mining Inc → No 1; 1983-09-14 to 1984-04-19; source msha-controller-operator-history
- **controller_controls_mine:** Mc Kenzie Jay R → No 1; 1983-09-14 to 1984-04-19; source msha-controller-operator-history
- **controller_controls_operator:** Mc Kenzie Jay R → Copper Valley Mining Inc; 1983-09-14 to 1984-04-19; source msha-controller-operator-history
- **operator_operates_mine:** Copper Valley Mining Inc → No 1; 1984-04-20 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Harper Dale → No 1; 1984-04-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Harper Dale → Copper Valley Mining Inc; 1984-04-20 to current/open; source msha-controller-operator-history