# Relationship history for MSHA mine 1500001

Current hierarchy: **CRH PLC → Mountain Materials Inc → Valley 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:** Acme Stone Company → Valley Stone; 1950-01-01 to 1991-02-05; source msha-controller-operator-history
- **controller_controls_mine:** Malcolm  Jones → Valley Stone; 1950-01-01 to 1991-02-05; source msha-controller-operator-history
- **controller_controls_operator:** Malcolm  Jones → Acme Stone Company; 1950-01-01 to 1991-02-05; source msha-controller-operator-history
- **controller_controls_mine:** Lafarge S A → Valley Stone; 1989-10-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Standard Lafarge → Valley Stone; 1991-02-06 to 1994-01-02; source msha-controller-operator-history
- **controller_controls_operator:** Lafarge S A → Standard Lafarge; 1991-02-06 to 1994-01-02; source msha-controller-operator-history
- **operator_operates_mine:** Ruth Brothers Inc → Valley Stone; 1994-01-03 to 2001-06-30; source msha-controller-operator-history
- **controller_controls_mine:** Rick  Ruth → Valley Stone; 1994-01-03 to 2001-06-30; source msha-controller-operator-history
- **controller_controls_operator:** Rick  Ruth → Ruth Brothers Inc; 1994-01-03 to 2001-06-30; source msha-controller-operator-history
- **operator_operates_mine:** Valley Stone Llc → Valley Stone; 2001-07-01 to 2009-02-24; source msha-controller-operator-history
- **controller_controls_mine:** Steve L  Lawson et al → Valley Stone; 2001-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Steve L  Lawson et al → Valley Stone Llc; 2001-07-01 to 2009-02-24; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → Valley Stone; 2006-01-23 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Mountain Materials Inc → Valley Stone; 2009-02-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → Mountain Materials Inc; 2009-02-25 to current/open; source msha-controller-operator-history