# Relationship history for MSHA mine 0901046

Current hierarchy: **CRH PLC → Harrison Construction Co Div/APAC-Atlantic Inc. → Harrison Chester White 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Chester White Construction Company → Harrison Chester White Quarry; 1990-01-01 to 2020-05-20; source msha-controller-operator-history
- **controller_controls_mine:** Chester  White → Harrison Chester White Quarry; 1990-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Chester  White → Chester White Construction Company; 1990-01-01 to 2020-05-20; source msha-controller-operator-history
- **controller_controls_mine:** Ashland Inc → Harrison Chester White Quarry; 2003-04-01 to 2006-08-27; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → Harrison Chester White Quarry; 2006-08-28 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Harrison Construction Co Div/APAC-Atlantic Inc. → Harrison Chester White Quarry; 2020-05-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ashland Inc → Harrison Construction Co Div/APAC-Atlantic Inc.; 2020-05-21 to 2006-08-27; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → Harrison Construction Co Div/APAC-Atlantic Inc.; 2020-05-21 to current/open; source msha-controller-operator-history