# Relationship history for MSHA mine 0101552

Current hierarchy: **Vulcan Materials Company → Vulcan Constr. Materials, L.P. → Roberta 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

- **controller_controls_mine:** Legacy Vulcan Corp (Form:Vulcan Materials Co) → Roberta Plant; 1950-01-01 to 2007-11-15; source msha-controller-operator-history
- **controller_controls_mine:** Martin Marietta Materials Inc → Roberta Plant; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Southern Ready Mix Inc → Roberta Plant; 1950-01-01 to 1984-03-01; source msha-controller-operator-history
- **controller_controls_mine:** William E  Prichard Jr → Roberta Plant; 1950-01-01 to 1984-03-01; source msha-controller-operator-history
- **controller_controls_operator:** William E  Prichard Jr → Southern Ready Mix Inc; 1950-01-01 to 1984-03-01; source msha-controller-operator-history
- **operator_operates_mine:** Southern Ready Mix Inc → Roberta Plant; 1984-03-02 to 1994-07-12; source msha-controller-operator-history
- **controller_controls_mine:** Lohja Inc → Roberta Plant; 1984-03-02 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lohja Inc → Southern Ready Mix Inc; 1984-03-02 to 1994-07-12; source msha-controller-operator-history
- **operator_operates_mine:** SRM Aggregates,  Inc. → Roberta Plant; 1994-07-13 to 2002-05-28; source msha-controller-operator-history
- **controller_controls_mine:** U S Aggregate Inc → Roberta Plant; 1994-07-13 to 2002-05-28; source msha-controller-operator-history
- **controller_controls_operator:** U S Aggregate Inc → SRM Aggregates,  Inc.; 1994-07-13 to 2002-05-28; source msha-controller-operator-history
- **controller_controls_mine:** Lafarge S A → Roberta Plant; 2001-07-12 to 2015-07-09; source msha-controller-operator-history
- **controller_controls_mine:** Lafarge S A → Roberta Plant; 2001-07-12 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Martin Marietta Materials → Roberta Plant; 2002-05-29 to 2003-10-09; source msha-controller-operator-history
- **controller_controls_operator:** Martin Marietta Materials Inc → Martin Marietta Materials; 2002-05-29 to 2003-10-09; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → Roberta Plant; 2002-05-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → SRM Aggregates,  Inc.; 2002-05-29 to 2002-05-28; source msha-controller-operator-history
- **operator_operates_mine:** Lafarge Birmingham Aggregates → Roberta Plant; 2003-10-10 to 2004-04-18; source msha-controller-operator-history
- **controller_controls_mine:** Lafarge S A → Roberta Plant; 2003-10-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Lafarge S A → Lafarge Birmingham Aggregates; 2003-10-10 to 2004-04-18; source msha-controller-operator-history
- **operator_operates_mine:** Lafarge Aggregates Southeast → Roberta Plant; 2004-04-19 to 2011-04-20; source msha-controller-operator-history
- **controller_controls_operator:** Lafarge S A → Lafarge Aggregates Southeast; 2004-04-19 to 2011-04-20; source msha-controller-operator-history
- **controller_controls_mine:** Vulcan Materials Company → Roberta Plant; 2007-11-16 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Lafarge Building Materials Inc → Roberta Plant; 2011-04-21 to 2011-10-02; source msha-controller-operator-history
- **controller_controls_operator:** Lafarge S A → Lafarge Building Materials Inc; 2011-04-21 to 2011-10-02; source msha-controller-operator-history
- **operator_operates_mine:** Vulcan Constr. Materials, L.P. → Roberta Plant; 2011-10-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Vulcan Materials Company → Vulcan Constr. Materials, L.P.; 2011-10-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Legacy Vulcan Corp (Form:Vulcan Materials Co) → Vulcan Constr. Materials, L.P.; 2011-10-03 to 2007-11-15; source msha-controller-operator-history
- **controller_controls_mine:** Holcim Ltd → Roberta Plant; 2015-07-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Holcim Ltd → Lafarge Building Materials Inc; 2015-07-10 to 2011-10-02; source msha-controller-operator-history