# Relationship history for MSHA mine 1800004

Current hierarchy: **Francis E  Gardiner III → Patuxent Aggregate Processors LLC → Delight Quarry**

- 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

- **operator_operates_mine:** Arundel Corp → Delight Quarry; 1950-01-01 to 1997-08-12; source msha-controller-operator-history
- **controller_controls_mine:** Florida Rock Industries Inc → Delight Quarry; 1950-01-01 to 1997-08-12; source msha-controller-operator-history
- **controller_controls_operator:** Florida Rock Industries Inc → Arundel Corp; 1950-01-01 to 1997-08-12; source msha-controller-operator-history
- **operator_operates_mine:** Patuxent Aggregate Processors LLC → Delight Quarry; 1997-08-13 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Francis E  Gardiner III et al → Delight Quarry; 1997-08-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Francis E  Gardiner III et al → Patuxent Aggregate Processors LLC; 1997-08-13 to current/open; source msha-controller-operator-history