# Relationship history for MSHA mine 1601527

Current hierarchy: **Michael  Simmons; Heather  Simmons → SIMMONS AND CROWE FARMS, LLC → S & C PLANT**

- 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:** George H  Wilson  et al → S & C PLANT; 1988-09-01 to 2023-01-09; source msha-controller-operator-history
- **operator_operates_mine:** Barriere Construction Company LLC → S & C PLANT; 2012-07-17 to 2024-06-04; source msha-controller-operator-history
- **controller_controls_operator:** George H  Wilson  et al → Barriere Construction Company LLC; 2012-07-17 to 2023-01-09; source msha-controller-operator-history
- **controller_controls_operator:** Peter A  Wilson  et al → Barriere Construction Company LLC; 2012-07-17 to 2023-01-09; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → S & C PLANT; 2023-01-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → Barriere Construction Company LLC; 2023-01-10 to 2024-06-04; source msha-controller-operator-history
- **operator_operates_mine:** SIMMONS AND CROWE FARMS, LLC → S & C PLANT; 2024-06-05 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Heather  Simmons et al → S & C PLANT; 2024-06-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Heather  Simmons et al → SIMMONS AND CROWE FARMS, LLC; 2024-06-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Michael  Simmons et al → SIMMONS AND CROWE FARMS, LLC; 2024-06-05 to current/open; source msha-controller-operator-history