# Relationship history for MSHA mine 1510290

Current hierarchy: **Hawkins Edd → J & H Coal Company → No 33**

- 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:** Reece Flat Coal Company → No 33; 1977-03-01 to 1982-08-01; source msha-controller-operator-history
- **controller_controls_mine:** Bartley Dennis D → No 33; 1977-03-01 to 1982-08-01; source msha-controller-operator-history
- **controller_controls_operator:** Bartley Dennis D → Reece Flat Coal Company; 1977-03-01 to 1982-08-01; source msha-controller-operator-history
- **controller_controls_mine:** Hawkins Edd → No 33; 1981-06-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** J & H Coal Company → No 33; 1982-08-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hawkins Edd → J & H Coal Company; 1982-08-02 to current/open; source msha-controller-operator-history