# Relationship history for MSHA mine 2800033

Current hierarchy: **Trap Rock Industries Inc; CRH PLC → Trap Rock Industries LLC → Kingston 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:** Trap Rock Industries Inc → Kingston Quarry; 1950-01-01 to 2012-12-30; source msha-controller-operator-history
- **controller_controls_mine:** William H  Stavola → Kingston Quarry; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** William H  Stavola → Trap Rock Industries Inc; 1950-01-01 to 2012-12-30; source msha-controller-operator-history
- **operator_operates_mine:** Trap Rock Industries LLC → Kingston Quarry; 2012-12-31 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC et al → Kingston Quarry; 2012-12-31 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC et al → Trap Rock Industries LLC; 2012-12-31 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Trap Rock Industries Inc et al → Trap Rock Industries LLC; 2012-12-31 to current/open; source msha-controller-operator-history