# Relationship history for MSHA mine 3300087

Current hierarchy: **CRH PLC → Stoneco Inc → Celina 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

- **controller_controls_mine:** Johnson S E Companies Inc → Celina Quarry; 1950-01-01 to 2003-06-15; source msha-controller-operator-history
- **operator_operates_mine:** John W Karch Stone Company → Celina Quarry; 1950-01-01 to 1988-07-24; source msha-controller-operator-history
- **controller_controls_mine:** George  Karch et al → Celina Quarry; 1950-01-01 to 1988-07-24; source msha-controller-operator-history
- **controller_controls_operator:** George  Karch et al → John W Karch Stone Company; 1950-01-01 to 1988-07-24; source msha-controller-operator-history
- **operator_operates_mine:** Stoneco Inc → Celina Quarry; 1988-07-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Johnson S E Companies Inc → Stoneco Inc; 1988-07-25 to 2003-06-15; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → Celina Quarry; 2003-06-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → Stoneco Inc; 2003-06-16 to current/open; source msha-controller-operator-history