# Relationship history for MSHA mine 4003168

Current hierarchy: **CRH PLC → Midsouth Aggregates → Sand Products of Monterey**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-18T09:31:49.615908+00:00

## Valid-time edges

- **operator_operates_mine:** Sand Products LLC → Sand Products of Monterey; 2001-05-01 to 2017-10-24; source msha-controller-operator-history
- **controller_controls_mine:** Billy C  Hall Et Al → Sand Products of Monterey; 2001-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Billy C  Hall Et Al → Sand Products LLC; 2001-05-01 to 2017-10-24; source msha-controller-operator-history
- **controller_controls_mine:** Ashland Inc → Sand Products of Monterey; 2003-04-01 to 2006-08-27; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → Sand Products of Monterey; 2006-08-28 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Sand Products of Monterey → Sand Products of Monterey; 2017-10-25 to 2018-10-22; source msha-controller-operator-history
- **controller_controls_mine:** Darrell  Hoover et al → Sand Products of Monterey; 2017-10-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Darrell  Hoover et al → Sand Products of Monterey; 2017-10-25 to 2018-10-22; source msha-controller-operator-history
- **controller_controls_operator:** Ronnie  Lane et al → Sand Products of Monterey; 2017-10-25 to 2018-10-22; source msha-controller-operator-history
- **operator_operates_mine:** Midsouth Aggregates → Sand Products of Monterey; 2018-10-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ashland Inc → Midsouth Aggregates; 2018-10-23 to 2006-08-27; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → Midsouth Aggregates; 2018-10-23 to current/open; source msha-controller-operator-history