# Relationship history for MSHA mine 2102963

Current hierarchy: **Amrize Ltd → Aggregate Industries → PORTABLE CRUSHER #2**

- 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:** William F  Holst III → PORTABLE CRUSHER #2; 1987-03-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Holst Excavating Inc → PORTABLE CRUSHER #2; 1987-06-01 to 2000-02-15; source msha-controller-operator-history
- **controller_controls_operator:** William F  Holst III → Holst Excavating Inc; 1987-06-01 to 2000-02-15; source msha-controller-operator-history
- **controller_controls_mine:** Aggregate Industries PLC → PORTABLE CRUSHER #2; 1995-10-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Camas Minnesota → PORTABLE CRUSHER #2; 2000-02-16 to 2002-03-04; source msha-controller-operator-history
- **controller_controls_operator:** Aggregate Industries PLC → Camas Minnesota; 2000-02-16 to 2002-03-04; source msha-controller-operator-history
- **controller_controls_mine:** Aggregate Industries PLC → PORTABLE CRUSHER #2; 2001-06-01 to 2009-04-29; source msha-controller-operator-history
- **operator_operates_mine:** Aggregate Industries → PORTABLE CRUSHER #2; 2002-03-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Aggregate Industries PLC → Aggregate Industries; 2002-03-05 to 2009-04-29; source msha-controller-operator-history
- **controller_controls_mine:** Holcim Ltd → PORTABLE CRUSHER #2; 2009-04-30 to 2015-07-09; source msha-controller-operator-history
- **controller_controls_operator:** Holcim Ltd → Aggregate Industries; 2009-04-30 to 2015-07-09; source msha-controller-operator-history
- **controller_controls_mine:** Holcim Ltd → PORTABLE CRUSHER #2; 2015-07-10 to 2025-06-22; source msha-controller-operator-history
- **controller_controls_operator:** Holcim Ltd → Aggregate Industries; 2015-07-10 to 2025-06-22; source msha-controller-operator-history
- **controller_controls_mine:** Amrize Ltd → PORTABLE CRUSHER #2; 2025-06-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Amrize Ltd → Aggregate Industries; 2025-06-23 to current/open; source msha-controller-operator-history