# Relationship history for MSHA mine 4402390

Current hierarchy: **Mark  Elliott → Ennstone Inc → FREDERICKSBURG 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:** Fredericksburg Sand & Gravel Company → FREDERICKSBURG SAND & GRAVEL; 1950-01-01 to 1984-05-29; source msha-controller-operator-history
- **controller_controls_mine:** Koppers Company Inc → FREDERICKSBURG SAND & GRAVEL; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Koppers Company Inc → Fredericksburg Sand & Gravel Company; 1950-01-01 to 1984-05-29; source msha-controller-operator-history
- **operator_operates_mine:** Culpeper Stone Company Inc → FREDERICKSBURG SAND & GRAVEL; 1984-05-30 to 1994-11-14; source msha-controller-operator-history
- **controller_controls_mine:** A G  Willis Jr  et al → FREDERICKSBURG SAND & GRAVEL; 1984-05-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** A G  Willis Jr  et al → Culpeper Stone Company Inc; 1984-05-30 to 1994-11-14; source msha-controller-operator-history
- **controller_controls_operator:** W H  Hurt Jr  et al → Culpeper Stone Company Inc; 1984-05-30 to 1994-11-14; source msha-controller-operator-history
- **operator_operates_mine:** Atlantic States Materials Corp → FREDERICKSBURG SAND & GRAVEL; 1994-11-15 to 1997-07-28; source msha-controller-operator-history
- **controller_controls_mine:** Bruntcliffe Aggregates PLC → FREDERICKSBURG SAND & GRAVEL; 1994-11-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bruntcliffe Aggregates PLC → Atlantic States Materials Corp; 1994-11-15 to 1997-07-28; source msha-controller-operator-history
- **operator_operates_mine:** Ennstone Inc → FREDERICKSBURG SAND & GRAVEL; 1997-07-29 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Ennstone PLC → FREDERICKSBURG SAND & GRAVEL; 1997-07-29 to 2009-06-10; source msha-controller-operator-history
- **controller_controls_operator:** Ennstone PLC → Ennstone Inc; 1997-07-29 to 2009-06-10; source msha-controller-operator-history
- **controller_controls_mine:** Mark  Elliott → FREDERICKSBURG SAND & GRAVEL; 2009-06-11 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Mark  Elliott → Ennstone Inc; 2009-06-11 to current/open; source msha-controller-operator-history