# Relationship history for MSHA mine 1500098

Current hierarchy: **CRH PLC → Mountain Materials → Carter City**

- 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

- **operator_operates_mine:** Standard Slag Company → Carter City; 1950-01-01 to 1989-09-30; source msha-controller-operator-history
- **controller_controls_mine:** Standard Slag Company → Carter City; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Standard Slag Company → Standard Slag Company; 1950-01-01 to 1989-09-30; source msha-controller-operator-history
- **operator_operates_mine:** Standard Lafarge → Carter City; 1989-10-01 to 1994-01-02; source msha-controller-operator-history
- **controller_controls_mine:** Lafarge S A → Carter City; 1989-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lafarge S A → Standard Lafarge; 1989-10-01 to 1994-01-02; source msha-controller-operator-history
- **operator_operates_mine:** Ruth Brothers Inc → Carter City; 1994-01-03 to 1998-09-02; source msha-controller-operator-history
- **controller_controls_mine:** Rick  Ruth → Carter City; 1994-01-03 to 2001-06-30; source msha-controller-operator-history
- **controller_controls_operator:** Rick  Ruth → Ruth Brothers Inc; 1994-01-03 to 1998-09-02; source msha-controller-operator-history
- **operator_operates_mine:** Mountain Materials, LLC → Carter City; 1998-09-03 to 2006-01-22; source msha-controller-operator-history
- **controller_controls_mine:** Steve L  Lawson et al → Carter City; 1998-09-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Steve L  Lawson et al → Mountain Materials, LLC; 1998-09-03 to 2006-01-22; source msha-controller-operator-history
- **operator_operates_mine:** Mountain Materials → Carter City; 2006-01-23 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → Carter City; 2006-01-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → Mountain Materials; 2006-01-23 to current/open; source msha-controller-operator-history