# Relationship history for MSHA mine 4406897

Current hierarchy: **Martin Marietta Materials Inc → MARTIN MARIETTA MATERIALS, INC. → MARTIN MARIETTA - RICH PATCH QUARRY**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Legacy Vulcan Corp (Form:Vulcan Materials Co) → MARTIN MARIETTA - RICH PATCH QUARRY; 1950-01-01 to 2007-11-15; source msha-controller-operator-history
- **controller_controls_mine:** Martin Marietta Materials Inc → MARTIN MARIETTA - RICH PATCH QUARRY; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Boxley Materials Co → MARTIN MARIETTA - RICH PATCH QUARRY; 1950-01-01 to 2016-03-20; source msha-controller-operator-history
- **operator_operates_mine:** Vulcan Constr. Materials, L.P. → MARTIN MARIETTA - RICH PATCH QUARRY; 1997-10-01 to 2002-05-12; source msha-controller-operator-history
- **controller_controls_operator:** Legacy Vulcan Corp (Form:Vulcan Materials Co) → Vulcan Constr. Materials, L.P.; 1997-10-01 to 2002-05-12; source msha-controller-operator-history
- **operator_operates_mine:** Boxley Materials Company → MARTIN MARIETTA - RICH PATCH QUARRY; 2002-05-13 to 2026-03-22; source msha-controller-operator-history
- **controller_controls_operator:** Boxley Materials Co → Boxley Materials Company; 2002-05-13 to 2016-03-20; source msha-controller-operator-history
- **controller_controls_mine:** Vulcan Materials Company → MARTIN MARIETTA - RICH PATCH QUARRY; 2007-11-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Vulcan Materials Company → Vulcan Constr. Materials, L.P.; 2007-11-16 to 2002-05-12; source msha-controller-operator-history
- **controller_controls_mine:** Summit Materials LLC → MARTIN MARIETTA - RICH PATCH QUARRY; 2016-03-21 to 2025-02-09; source msha-controller-operator-history
- **controller_controls_operator:** Summit Materials LLC → Boxley Materials Company; 2016-03-21 to 2025-02-09; source msha-controller-operator-history
- **controller_controls_mine:** Quikrete Holdings Inc. → MARTIN MARIETTA - RICH PATCH QUARRY; 2025-02-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Quikrete Holdings Inc. → Boxley Materials Company; 2025-02-10 to 2026-03-22; source msha-controller-operator-history
- **operator_operates_mine:** Martin Marietta Materials, Inc. → MARTIN MARIETTA - RICH PATCH QUARRY; 2026-03-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Martin Marietta Materials Inc → Martin Marietta Materials, Inc.; 2026-03-23 to current/open; source msha-controller-operator-history