# Relationship history for MSHA mine 3003083

Current hierarchy: **Thompson Terry → Thompson Farms Quarry → THOMPSON FARMS SAND 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

- **controller_controls_mine:** Thompson Terry → THOMPSON FARMS SAND PIT; 1991-06-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Thompson Farms Quarry → THOMPSON FARMS SAND PIT; 1993-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Thompson Terry → Thompson Farms Quarry; 1993-07-01 to current/open; source msha-controller-operator-history