# Relationship history for MSHA mine 0901035

Current hierarchy: **CRH PLC → Midsouth Aggregates → Forsyth 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:** Martin Marietta Materials Inc → Forsyth Quarry; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Martin Marietta Materials Inc → Forsyth Quarry; 1988-05-01 to 2018-05-03; source msha-controller-operator-history
- **controller_controls_operator:** Martin Marietta Materials Inc → Martin Marietta Materials Inc; 1988-05-01 to 2018-05-03; source msha-controller-operator-history
- **controller_controls_mine:** U S Aggregate Inc → Forsyth Quarry; 1994-07-13 to 2002-05-28; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → Forsyth Quarry; 2002-05-29 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Ashland Inc → Forsyth Quarry; 2003-04-01 to 2006-08-27; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → Forsyth Quarry; 2006-08-28 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Midsouth Aggregates → Forsyth Quarry; 2018-05-04 to 2020-01-16; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → Midsouth Aggregates; 2018-05-04 to 2020-01-16; source msha-controller-operator-history
- **controller_controls_operator:** U S Aggregate Inc → Midsouth Aggregates; 2018-05-04 to 2002-05-28; source msha-controller-operator-history
- **operator_operates_mine:** Midsouth Aggregates → Forsyth Quarry; 2020-01-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ashland Inc → Midsouth Aggregates; 2020-01-17 to 2006-08-27; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → Midsouth Aggregates; 2020-01-17 to current/open; source msha-controller-operator-history