# Relationship history for MSHA mine 2102954

Current hierarchy: **Amrize Ltd → Aggregate Industries - NCR Inc → Ottertail Aggregate**

- 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:** Ottertail Ready Mix → Ottertail Aggregate; 1986-12-01 to 1998-08-17; source msha-controller-operator-history
- **controller_controls_mine:** James E  Ahlfs → Ottertail Aggregate; 1986-12-01 to 1998-08-17; source msha-controller-operator-history
- **controller_controls_operator:** James E  Ahlfs → Ottertail Ready Mix; 1986-12-01 to 1998-08-17; source msha-controller-operator-history
- **controller_controls_mine:** Aggregate Industries PLC → Ottertail Aggregate; 1997-05-14 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** CAMAS Minndak, Inc. → Ottertail Aggregate; 1998-08-18 to 2002-03-06; source msha-controller-operator-history
- **controller_controls_operator:** Aggregate Industries PLC → CAMAS Minndak, Inc.; 1998-08-18 to 2002-03-06; source msha-controller-operator-history
- **controller_controls_mine:** Aggregate Industries PLC → Ottertail Aggregate; 2001-06-01 to 2009-04-29; source msha-controller-operator-history
- **operator_operates_mine:** Aggregate Industries, Inc. → Ottertail Aggregate; 2002-03-07 to 2003-11-25; source msha-controller-operator-history
- **controller_controls_operator:** Aggregate Industries PLC → Aggregate Industries, Inc.; 2002-03-07 to 2003-11-25; source msha-controller-operator-history
- **operator_operates_mine:** Aggregate Industries - NCR Inc → Ottertail Aggregate; 2003-11-26 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Aggregate Industries PLC → Ottertail Aggregate; 2003-11-26 to 2009-04-29; source msha-controller-operator-history
- **controller_controls_operator:** Aggregate Industries PLC → Aggregate Industries - NCR Inc; 2003-11-26 to 2009-04-29; source msha-controller-operator-history
- **controller_controls_mine:** Holcim Ltd → Ottertail Aggregate; 2009-04-30 to 2015-07-09; source msha-controller-operator-history
- **controller_controls_operator:** Holcim Ltd → Aggregate Industries, Inc.; 2009-04-30 to 2003-11-25; source msha-controller-operator-history
- **controller_controls_operator:** Holcim Ltd → Aggregate Industries - NCR Inc; 2009-04-30 to 2015-07-09; source msha-controller-operator-history
- **controller_controls_mine:** Holcim Ltd → Ottertail Aggregate; 2015-07-10 to 2025-06-22; source msha-controller-operator-history
- **controller_controls_operator:** Holcim Ltd → Aggregate Industries, Inc.; 2015-07-10 to 2003-11-25; source msha-controller-operator-history
- **controller_controls_operator:** Holcim Ltd → Aggregate Industries - NCR Inc; 2015-07-10 to 2025-06-22; source msha-controller-operator-history
- **controller_controls_mine:** Amrize Ltd → Ottertail Aggregate; 2025-06-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Amrize Ltd → Aggregate Industries, Inc.; 2025-06-23 to 2003-11-25; source msha-controller-operator-history
- **controller_controls_operator:** Amrize Ltd → Aggregate Industries - NCR Inc; 2025-06-23 to current/open; source msha-controller-operator-history