# Relationship history for MSHA mine 4001946

Current hierarchy: **CRH PLC → Harrison Const Co Div /APAC-Atlantic Inc → Harrison Sand Company**

- 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:** Highland Sand Company → Harrison Sand Company; 1950-01-01 to 2008-04-03; source msha-controller-operator-history
- **controller_controls_mine:** James D  Rivers → Harrison Sand Company; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** James D  Rivers → Highland Sand Company; 1950-01-01 to 2008-04-03; source msha-controller-operator-history
- **controller_controls_mine:** Ashland Inc → Harrison Sand Company; 2003-04-01 to 2006-08-27; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → Harrison Sand Company; 2006-08-28 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Harrison Const Co Div /APAC-Atlantic Inc → Harrison Sand Company; 2008-04-04 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ashland Inc → Harrison Const Co Div /APAC-Atlantic Inc; 2008-04-04 to 2006-08-27; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → Harrison Const Co Div /APAC-Atlantic Inc; 2008-04-04 to current/open; source msha-controller-operator-history