# Relationship history for MSHA mine 1511922

Current hierarchy: **Sterling  Tackett → P & H 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:** Coleman Clifford → No 1; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Nuclear Dynamics Resources Inc → No 1; 1975-08-01 to 1985-06-27; source msha-controller-operator-history
- **operator_operates_mine:** Mountain View Coal Company Inc → No 1; 1979-06-01 to 1980-06-10; source msha-controller-operator-history
- **controller_controls_operator:** Coleman Clifford → Mountain View Coal Company Inc; 1979-06-01 to 1980-06-10; source msha-controller-operator-history
- **operator_operates_mine:** T T & V Coal Company Inc → No 1; 1980-06-11 to 1984-04-29; source msha-controller-operator-history
- **controller_controls_mine:** Tackett Sterling & Michael Vance → No 1; 1980-06-11 to 1984-04-29; source msha-controller-operator-history
- **controller_controls_operator:** Tackett Sterling & Michael Vance → T T & V Coal Company Inc; 1980-06-11 to 1984-04-29; source msha-controller-operator-history
- **operator_operates_mine:** Aztec Mining Company → No 1; 1984-04-30 to 1985-06-27; source msha-controller-operator-history
- **controller_controls_operator:** Nuclear Dynamics Resources Inc → Aztec Mining Company; 1984-04-30 to 1985-06-27; source msha-controller-operator-history
- **controller_controls_mine:** Woodard Jessie → No 1; 1985-01-01 to 1986-04-06; source msha-controller-operator-history
- **operator_operates_mine:** Poly-Tech Mining Inc → No 1; 1985-06-28 to 1986-04-06; source msha-controller-operator-history
- **controller_controls_operator:** Woodard Jessie → Poly-Tech Mining Inc; 1985-06-28 to 1986-04-06; source msha-controller-operator-history
- **operator_operates_mine:** P & H Coal Company Inc → No 1; 1986-04-07 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Sterling  Tackett → No 1; 1986-04-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Sterling  Tackett → P & H Coal Company Inc; 1986-04-07 to current/open; source msha-controller-operator-history