# Relationship history for MSHA mine 1500056

Current hierarchy: **CRH PLC → Mountain Aggregates, Inc → Pine Mountain Stone**

- 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:** Adams Stone Corp → Pine Mountain Stone; 1950-01-01 to 1992-06-30; source msha-controller-operator-history
- **controller_controls_mine:** Stuart H  Adams → Pine Mountain Stone; 1950-01-01 to 1992-06-30; source msha-controller-operator-history
- **controller_controls_operator:** Stuart H  Adams → Adams Stone Corp; 1950-01-01 to 1992-06-30; source msha-controller-operator-history
- **operator_operates_mine:** Pine Mountain Stone LLC → Pine Mountain Stone; 1992-07-01 to 2006-01-22; source msha-controller-operator-history
- **controller_controls_mine:** Steve L  Lawson et al → Pine Mountain Stone; 1992-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Steve L  Lawson et al → Pine Mountain Stone LLC; 1992-07-01 to 2006-01-22; source msha-controller-operator-history
- **operator_operates_mine:** Mountain Aggregates, Inc → Pine Mountain Stone; 2006-01-23 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → Pine Mountain Stone; 2006-01-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → Mountain Aggregates, Inc; 2006-01-23 to current/open; source msha-controller-operator-history