# Relationship history for MSHA mine 1600872

Current hierarchy: **Texas Industries Inc → Louisiana Industries → PEARL RIVER SAND & GRAVEL(PIT#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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Texas Industries Inc → PEARL RIVER SAND & GRAVEL(PIT#1); 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** T L James & Company Inc → PEARL RIVER SAND & GRAVEL(PIT#1); 1950-01-01 to 1996-09-27; source msha-controller-operator-history
- **controller_controls_mine:** T L James & Company Inc → PEARL RIVER SAND & GRAVEL(PIT#1); 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** T L James & Company Inc → T L James & Company Inc; 1950-01-01 to 1996-09-27; source msha-controller-operator-history
- **operator_operates_mine:** Louisiana Industries → PEARL RIVER SAND & GRAVEL(PIT#1); 1996-09-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Texas Industries Inc → Louisiana Industries; 1996-09-28 to current/open; source msha-controller-operator-history