# Relationship history for MSHA mine 4405172

Current hierarchy: **Salem Stone Corp; Cliftondale Ready Mix LLC → South River Stone LLC → Lynnwood Farm**

- 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:** Robert Brett House → Lynnwood Farm; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Aggregate Industries PLC → Lynnwood Farm; 1950-01-01 to 2009-04-29; source msha-controller-operator-history
- **operator_operates_mine:** West Sand & Gravel Company Inc → Lynnwood Farm; 1979-01-01 to 2002-07-14; source msha-controller-operator-history
- **controller_controls_operator:** Robert Brett House → West Sand & Gravel Company Inc; 1979-01-01 to 2002-07-14; source msha-controller-operator-history
- **operator_operates_mine:** Brett Aggregates Inc → Lynnwood Farm; 2002-07-15 to 2008-06-23; source msha-controller-operator-history
- **controller_controls_mine:** Robert Brett House → Lynnwood Farm; 2002-07-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert Brett House → Brett Aggregates Inc; 2002-07-15 to 2008-06-23; source msha-controller-operator-history
- **operator_operates_mine:** Mid-Atlantic Materials Inc → Lynnwood Farm; 2008-06-24 to 2009-04-30; source msha-controller-operator-history
- **controller_controls_operator:** Aggregate Industries PLC → Mid-Atlantic Materials Inc; 2008-06-24 to 2009-04-29; source msha-controller-operator-history
- **controller_controls_mine:** Holcim Ltd → Lynnwood Farm; 2009-04-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Holcim Ltd → Mid-Atlantic Materials Inc; 2009-04-30 to 2009-04-30; source msha-controller-operator-history
- **operator_operates_mine:** South River Stone LLC → Lynnwood Farm; 2009-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Cliftondale Ready Mix LLC et al → Lynnwood Farm; 2009-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Cliftondale Ready Mix LLC et al → South River Stone LLC; 2009-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Salem Stone Corp et al → South River Stone LLC; 2009-05-01 to current/open; source msha-controller-operator-history