# Relationship history for MSHA mine 1516874

Current hierarchy: **Justus Donald → Quad Mining Company Inc → #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 Roy Darrell → #1; 1986-12-15 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Tabcol Mining Inc → #1; 1990-04-01 to 1992-04-21; source msha-controller-operator-history
- **controller_controls_operator:** Coleman Roy Darrell → Tabcol Mining Inc; 1990-04-01 to 1992-04-21; source msha-controller-operator-history
- **operator_operates_mine:** Quad Mining Company Inc → #1; 1992-04-22 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Justus Donald Et Al → #1; 1992-04-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Justus Donald Et Al → Quad Mining Company Inc; 1992-04-22 to current/open; source msha-controller-operator-history