# Relationship history for MSHA mine 3600131

Current hierarchy: **Heidelberg Materials AG → Hanson Aggregates BMC, Inc → Latrobe 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:** Latrobe Construction Company → Latrobe Plant; 1950-01-01 to 2002-03-14; source msha-controller-operator-history
- **controller_controls_mine:** Bruno  Ferrari Jr → Latrobe Plant; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bruno  Ferrari Jr → Latrobe Construction Company; 1950-01-01 to 2002-03-14; source msha-controller-operator-history
- **controller_controls_mine:** USS Holdings Inc → Latrobe Plant; 1996-03-09 to 2003-07-18; source msha-controller-operator-history
- **operator_operates_mine:** Hanson Aggregates BMC, Inc → Latrobe Plant; 2002-03-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** USS Holdings Inc → Hanson Aggregates BMC, Inc; 2002-03-15 to 2003-07-18; source msha-controller-operator-history
- **controller_controls_mine:** Hanson PLC → Latrobe Plant; 2003-07-19 to 2007-08-22; source msha-controller-operator-history
- **controller_controls_operator:** Hanson PLC → Hanson Aggregates BMC, Inc; 2003-07-19 to 2007-08-22; source msha-controller-operator-history
- **controller_controls_mine:** Heidelberg Materials AG → Latrobe Plant; 2007-08-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Heidelberg Materials AG → Hanson Aggregates BMC, Inc; 2007-08-23 to current/open; source msha-controller-operator-history