# Relationship history for MSHA mine 2200120

Current hierarchy: **Hopper John L → Tri-Sands Inc → Tishomingo Pit**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Tri-State Sand Company → Tishomingo Pit; 1950-01-01 to 1983-08-14; source msha-controller-operator-history
- **controller_controls_mine:** Dee  Wills Goodwin et al → Tishomingo Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Dee  Wills Goodwin et al → Tri-State Sand Company; 1950-01-01 to 1983-08-14; source msha-controller-operator-history
- **controller_controls_operator:** Paul  Wills et al → Tri-State Sand Company; 1950-01-01 to 1983-08-14; source msha-controller-operator-history
- **operator_operates_mine:** Tri-Sands Inc → Tishomingo Pit; 1983-08-15 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Hopper John L → Tishomingo Pit; 1983-08-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hopper John L → Tri-Sands Inc; 1983-08-15 to current/open; source msha-controller-operator-history