# Relationship history for MSHA mine 3303938

Current hierarchy: **John  Hess → Copperhead Coal Company → M & M 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:** Olen O  Miller → M & M Strip; 1982-08-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Miller Mining Inc → M & M Strip; 1983-04-01 to 1998-03-01; source msha-controller-operator-history
- **controller_controls_operator:** Olen O  Miller → Miller Mining Inc; 1983-04-01 to 1998-03-01; source msha-controller-operator-history
- **operator_operates_mine:** Copperhead Coal Company → M & M Strip; 1998-03-02 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** John  Hess → M & M Strip; 1998-03-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John  Hess → Copperhead Coal Company; 1998-03-02 to current/open; source msha-controller-operator-history