# Relationship history for MSHA mine 1800705

Current hierarchy: **Amrize Ltd → Bardon Inc → BRANDYWINE PIT**

- 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:** Aggregate Industries PLC → BRANDYWINE PIT; 1950-01-01 to 2009-04-29; source msha-controller-operator-history
- **controller_controls_mine:** Aggregate Industries PLC → BRANDYWINE PIT; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** E L Gardner Inc → BRANDYWINE PIT; 1984-05-01 to 2003-04-28; source msha-controller-operator-history
- **controller_controls_operator:** Aggregate Industries PLC → E L Gardner Inc; 1984-05-01 to 2003-04-28; source msha-controller-operator-history
- **operator_operates_mine:** Bardon Inc → BRANDYWINE PIT; 2003-04-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Aggregate Industries PLC → Bardon Inc; 2003-04-29 to 2009-04-29; source msha-controller-operator-history
- **controller_controls_mine:** Holcim Ltd → BRANDYWINE PIT; 2009-04-30 to 2015-07-09; source msha-controller-operator-history
- **controller_controls_operator:** Holcim Ltd → Bardon Inc; 2009-04-30 to 2015-07-09; source msha-controller-operator-history
- **controller_controls_mine:** Holcim Ltd → BRANDYWINE PIT; 2015-07-10 to 2025-06-22; source msha-controller-operator-history
- **controller_controls_operator:** Holcim Ltd → Bardon Inc; 2015-07-10 to 2025-06-22; source msha-controller-operator-history
- **controller_controls_mine:** Amrize Ltd → BRANDYWINE PIT; 2025-06-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Amrize Ltd → Bardon Inc; 2025-06-23 to current/open; source msha-controller-operator-history