# Relationship history for MSHA mine 1516257

Current hierarchy: **John G Liter → Liter's Inc → TRIMBLE COUNTY SAND & GRAVEL**

- 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:** Clark Sand & Gravel Company Inc → TRIMBLE COUNTY SAND & GRAVEL; 1987-12-01 to 1994-04-20; source msha-controller-operator-history
- **controller_controls_mine:** Joe W  Clark → TRIMBLE COUNTY SAND & GRAVEL; 1987-12-01 to 1994-04-20; source msha-controller-operator-history
- **controller_controls_operator:** Joe W  Clark → Clark Sand & Gravel Company Inc; 1987-12-01 to 1994-04-20; source msha-controller-operator-history
- **controller_controls_mine:** Robert T  Liter et al → TRIMBLE COUNTY SAND & GRAVEL; 1993-07-01 to 2025-01-08; source msha-controller-operator-history
- **operator_operates_mine:** Liter's Inc → TRIMBLE COUNTY SAND & GRAVEL; 1994-04-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert T  Liter et al → Liter's Inc; 1994-04-21 to 2025-01-08; source msha-controller-operator-history
- **controller_controls_mine:** John G Liter → TRIMBLE COUNTY SAND & GRAVEL; 2025-01-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** John G Liter → Liter's Inc; 2025-01-09 to current/open; source msha-controller-operator-history