# Relationship history for MSHA mine 2800545

Current hierarchy: **Heidelberg Materials AG → Heidelberg Materials Northeast LLC. → Millville 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

- **operator_operates_mine:** Pennsylvania Glass Sand Corp → Millville Plant; 1950-01-01 to 1986-04-01; source msha-controller-operator-history
- **controller_controls_mine:** ITT Corp → Millville Plant; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** ITT Corp → Pennsylvania Glass Sand Corp; 1950-01-01 to 1986-04-01; source msha-controller-operator-history
- **operator_operates_mine:** U S Silica Company → Millville Plant; 1986-04-02 to 1996-03-08; source msha-controller-operator-history
- **controller_controls_mine:** Rio Tinto Group → Millville Plant; 1986-04-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Rio Tinto Group → U S Silica Company; 1986-04-02 to 1996-03-08; source msha-controller-operator-history
- **controller_controls_mine:** Hanson PLC → Millville Plant; 1988-11-14 to 2007-08-22; source msha-controller-operator-history
- **operator_operates_mine:** Better Materials Corp → Millville Plant; 1996-03-09 to 2002-08-31; source msha-controller-operator-history
- **controller_controls_mine:** USS Holdings Inc → Millville Plant; 1996-03-09 to 2003-07-18; source msha-controller-operator-history
- **controller_controls_operator:** USS Holdings Inc → Better Materials Corp; 1996-03-09 to 2002-08-31; source msha-controller-operator-history
- **controller_controls_mine:** USS Holdings Inc → Millville Plant; 1996-03-09 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** US Silica Company → Millville Plant; 2002-09-01 to 2007-07-08; source msha-controller-operator-history
- **controller_controls_operator:** USS Holdings Inc → US Silica Company; 2002-09-01 to 2007-07-08; source msha-controller-operator-history
- **controller_controls_mine:** Hanson PLC → Millville Plant; 2003-07-19 to 2007-08-22; source msha-controller-operator-history
- **controller_controls_operator:** Hanson PLC → Better Materials Corp; 2003-07-19 to 2002-08-31; source msha-controller-operator-history
- **operator_operates_mine:** Hanson Aggregates BMC → Millville Plant; 2007-07-09 to 2023-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Hanson PLC → Hanson Aggregates BMC; 2007-07-09 to 2007-08-22; source msha-controller-operator-history
- **controller_controls_operator:** USS Holdings Inc → Hanson Aggregates BMC; 2007-07-09 to 2003-07-18; source msha-controller-operator-history
- **controller_controls_mine:** Heidelberg Materials AG → Millville Plant; 2007-08-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Heidelberg Materials AG → Better Materials Corp; 2007-08-23 to 2002-08-31; source msha-controller-operator-history
- **controller_controls_operator:** Heidelberg Materials AG → Hanson Aggregates BMC; 2007-08-23 to 2023-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Heidelberg Materials Northeast LLC. → Millville Plant; 2024-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Heidelberg Materials AG → Heidelberg Materials Northeast LLC.; 2024-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hanson PLC → Heidelberg Materials Northeast LLC.; 2024-01-01 to 2007-08-22; source msha-controller-operator-history