# Relationship history for MSHA mine 2002781

Current hierarchy: **Amrize Ltd → Aggregate Industries Northeast Regi → RUNKLE ROAD PLANT**

- 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:** Bill W  Smith → RUNKLE ROAD PLANT; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Bill Smith Sand & Gravel Inc → RUNKLE ROAD PLANT; 1987-07-01 to 1999-01-21; source msha-controller-operator-history
- **controller_controls_operator:** Bill W  Smith → Bill Smith Sand & Gravel Inc; 1987-07-01 to 1999-01-21; source msha-controller-operator-history
- **operator_operates_mine:** Aggregate Industries Northeast Regi → RUNKLE ROAD PLANT; 1999-01-22 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Aggregate Industries PLC → RUNKLE ROAD PLANT; 2001-06-01 to 2009-04-29; source msha-controller-operator-history
- **controller_controls_operator:** Aggregate Industries PLC → Aggregate Industries Northeast Regi; 2001-06-01 to 2009-04-29; source msha-controller-operator-history
- **controller_controls_mine:** Holcim Ltd → RUNKLE ROAD PLANT; 2009-04-30 to 2015-07-09; source msha-controller-operator-history
- **controller_controls_operator:** Holcim Ltd → Aggregate Industries Northeast Regi; 2009-04-30 to 2015-07-09; source msha-controller-operator-history
- **controller_controls_mine:** Holcim Ltd → RUNKLE ROAD PLANT; 2015-07-10 to 2025-06-22; source msha-controller-operator-history
- **controller_controls_operator:** Holcim Ltd → Aggregate Industries Northeast Regi; 2015-07-10 to 2025-06-22; source msha-controller-operator-history
- **controller_controls_mine:** Amrize Ltd → RUNKLE ROAD PLANT; 2025-06-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Amrize Ltd → Aggregate Industries Northeast Regi; 2025-06-23 to current/open; source msha-controller-operator-history