# Relationship history for MSHA mine 4405494

Current hierarchy: **Hackney Frank W → M P & M Coal Company 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

- **controller_controls_mine:** Cowan James D → No 1; 1978-08-14 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Mary Lou Coal Corp → No 1; 1980-08-01 to 1980-12-01; source msha-controller-operator-history
- **controller_controls_operator:** Cowan James D → Mary Lou Coal Corp; 1980-08-01 to 1980-12-01; source msha-controller-operator-history
- **operator_operates_mine:** New Hope Coal Company Inc → No 1; 1980-12-02 to 1981-10-20; source msha-controller-operator-history
- **controller_controls_mine:** Merricks Johnny Iii → No 1; 1980-12-02 to 1981-10-20; source msha-controller-operator-history
- **controller_controls_operator:** Merricks Johnny Iii → New Hope Coal Company Inc; 1980-12-02 to 1981-10-20; source msha-controller-operator-history
- **operator_operates_mine:** M P & M Coal Company Inc → No 1; 1981-10-21 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Hackney Frank W → No 1; 1981-10-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hackney Frank W → M P & M Coal Company Inc; 1981-10-21 to current/open; source msha-controller-operator-history