# Relationship history for MSHA mine 4403227

Current hierarchy: **A G  Willis Jr; W H  Hurt Jr → Culpeper Stone Company Inc → HAYMARKET 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:** Culpeper Stone Company Inc → HAYMARKET QUARRY; 1950-01-01 to 1984-05-29; source msha-controller-operator-history
- **controller_controls_mine:** Koppers Company Inc → HAYMARKET QUARRY; 1950-01-01 to 1984-05-29; source msha-controller-operator-history
- **controller_controls_operator:** Koppers Company Inc → Culpeper Stone Company Inc; 1950-01-01 to 1984-05-29; source msha-controller-operator-history
- **operator_operates_mine:** Culpeper Stone Company Inc → HAYMARKET QUARRY; 1984-05-30 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** W H  Hurt Jr  et al → HAYMARKET QUARRY; 1984-05-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** W H  Hurt Jr  et al → Culpeper Stone Company Inc; 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 current/open; source msha-controller-operator-history