# Relationship history for MSHA mine 0801243

Current hierarchy: **CRH PLC → Preferred Materials, Inc. → Laurel Shell Pit**

- 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:** Ashland Inc → Laurel Shell Pit; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Apac-Florida Inc → Laurel Shell Pit; 1996-11-01 to 2003-03-30; source msha-controller-operator-history
- **controller_controls_operator:** Ashland Inc → Apac-Florida Inc; 1996-11-01 to 2003-03-30; source msha-controller-operator-history
- **operator_operates_mine:** Preferred Materials, Inc. → Laurel Shell Pit; 2003-03-31 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Ashland Inc → Laurel Shell Pit; 2003-03-31 to 2006-08-27; source msha-controller-operator-history
- **controller_controls_operator:** Ashland Inc → Preferred Materials, Inc.; 2003-03-31 to 2006-08-27; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → Laurel Shell Pit; 2006-08-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → Preferred Materials, Inc.; 2006-08-28 to current/open; source msha-controller-operator-history