# Relationship history for MSHA mine 0502554

Current hierarchy: **Amrize Ltd → Aggregate Industries WRC Inc → Deer Creek 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:** Koppers Company Inc → Deer Creek Plant; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Winslow Construction Company → Deer Creek Plant; 1950-01-01 to 1980-10-13; source msha-controller-operator-history
- **controller_controls_mine:** Winslow Construction Company → Deer Creek Plant; 1950-01-01 to 1980-10-13; source msha-controller-operator-history
- **controller_controls_operator:** Winslow Construction Company → Winslow Construction Company; 1950-01-01 to 1980-10-13; source msha-controller-operator-history
- **operator_operates_mine:** Western Paving Construction Company → Deer Creek Plant; 1980-10-14 to 1987-05-28; source msha-controller-operator-history
- **controller_controls_operator:** Koppers Company Inc → Western Paving Construction Company; 1980-10-14 to 1987-05-28; source msha-controller-operator-history
- **operator_operates_mine:** Western Paving Construction Company → Deer Creek Plant; 1987-05-29 to 1988-06-13; source msha-controller-operator-history
- **controller_controls_mine:** Koppers Co Inc & Redland Plc → Deer Creek Plant; 1987-05-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Koppers Co Inc & Redland Plc → Western Paving Construction Company; 1987-05-29 to 1988-06-13; source msha-controller-operator-history
- **operator_operates_mine:** Western Paving Construction Company → Deer Creek Plant; 1988-06-14 to 1998-02-28; source msha-controller-operator-history
- **controller_controls_mine:** Redland Plc → Deer Creek Plant; 1988-06-14 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Redland Plc → Western Paving Construction Company; 1988-06-14 to 1998-02-28; source msha-controller-operator-history
- **controller_controls_mine:** Aggregate Industries PLC → Deer Creek Plant; 1997-05-14 to 2009-04-29; source msha-controller-operator-history
- **operator_operates_mine:** K J Hammer Companies Inc → Deer Creek Plant; 1998-03-01 to 1999-01-29; source msha-controller-operator-history
- **controller_controls_mine:** Karen  Hammer → Deer Creek Plant; 1998-03-01 to 1999-01-29; source msha-controller-operator-history
- **controller_controls_operator:** Karen  Hammer → K J Hammer Companies Inc; 1998-03-01 to 1999-01-29; source msha-controller-operator-history
- **operator_operates_mine:** Aggregate Industries WRC Inc → Deer Creek Plant; 1999-01-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Aggregate Industries PLC → Aggregate Industries WRC Inc; 1999-01-30 to 2009-04-29; source msha-controller-operator-history
- **controller_controls_mine:** Holcim Ltd → Deer Creek Plant; 2009-04-30 to 2015-07-09; source msha-controller-operator-history
- **controller_controls_operator:** Holcim Ltd → Aggregate Industries WRC Inc; 2009-04-30 to 2015-07-09; source msha-controller-operator-history
- **controller_controls_mine:** Holcim Ltd → Deer Creek Plant; 2015-07-10 to 2025-06-22; source msha-controller-operator-history
- **controller_controls_operator:** Holcim Ltd → Aggregate Industries WRC Inc; 2015-07-10 to 2025-06-22; source msha-controller-operator-history
- **controller_controls_mine:** Amrize Ltd → Deer Creek Plant; 2025-06-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Amrize Ltd → Aggregate Industries WRC Inc; 2025-06-23 to current/open; source msha-controller-operator-history