# Relationship history for MSHA mine 1516668

Current hierarchy: **Justus Donald → Quad Mining Company Inc → No 3**

- 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:** Robinson Clyde → No 3; 1980-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Kenneth  Hurley et al → No 3; 1986-08-22 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Hope Mining Inc → No 3; 1989-07-01 to 1990-06-19; source msha-controller-operator-history
- **controller_controls_operator:** Kenneth  Hurley et al → Hope Mining Inc; 1989-07-01 to 1990-06-19; source msha-controller-operator-history
- **controller_controls_operator:** Bernie  Hurley et al → Hope Mining Inc; 1989-07-01 to 1990-06-19; source msha-controller-operator-history
- **controller_controls_mine:** Coleman Clifford & Mike → No 3; 1989-10-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Betty Coal Company Inc → No 3; 1990-06-20 to 1991-04-03; source msha-controller-operator-history
- **controller_controls_operator:** Robinson Clyde → Betty Coal Company Inc; 1990-06-20 to 1991-04-03; source msha-controller-operator-history
- **operator_operates_mine:** Indian Creek Mining Inc → No 3; 1991-04-04 to 1992-11-24; source msha-controller-operator-history
- **controller_controls_operator:** Coleman Clifford & Mike → Indian Creek Mining Inc; 1991-04-04 to 1992-11-24; source msha-controller-operator-history
- **controller_controls_mine:** Justus Donald Et Al → No 3; 1992-04-22 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Quad Mining Company Inc → No 3; 1992-11-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Justus Donald Et Al → Quad Mining Company Inc; 1992-11-25 to current/open; source msha-controller-operator-history