# Relationship history for MSHA mine 3304139

Current hierarchy: **Heidelberg Materials AG → Hanson Aggregates Midwest, LLC → Sylvania Quarry II**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Johnson S E Companies Inc → Sylvania Quarry II; 1950-01-01 to 2003-06-15; source msha-controller-operator-history
- **controller_controls_mine:** Colas S A → Sylvania Quarry II; 1979-12-14 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Atlas Stone Company → Sylvania Quarry II; 1988-06-01 to 1990-02-26; source msha-controller-operator-history
- **controller_controls_mine:** Theodore  Hutchinson → Sylvania Quarry II; 1988-06-01 to 1990-02-26; source msha-controller-operator-history
- **controller_controls_operator:** Theodore  Hutchinson → Atlas Stone Company; 1988-06-01 to 1990-02-26; source msha-controller-operator-history
- **controller_controls_mine:** Hanson PLC → Sylvania Quarry II; 1988-11-14 to 2007-08-22; source msha-controller-operator-history
- **operator_operates_mine:** Essroc Materials Inc → Sylvania Quarry II; 1990-02-27 to 1994-03-17; source msha-controller-operator-history
- **controller_controls_mine:** Italcementi Spa → Sylvania Quarry II; 1990-02-27 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Italcementi Spa → Essroc Materials Inc; 1990-02-27 to 1994-03-17; source msha-controller-operator-history
- **operator_operates_mine:** Barrett Paving Materials Inc → Sylvania Quarry II; 1994-03-18 to 2004-06-30; source msha-controller-operator-history
- **controller_controls_operator:** Colas S A → Barrett Paving Materials Inc; 1994-03-18 to 2004-06-30; source msha-controller-operator-history
- **controller_controls_mine:** CRH PLC → Sylvania Quarry II; 2003-06-16 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Stoneco Inc → Sylvania Quarry II; 2004-07-01 to 2004-11-11; source msha-controller-operator-history
- **controller_controls_operator:** Johnson S E Companies Inc → Stoneco Inc; 2004-07-01 to 2003-06-15; source msha-controller-operator-history
- **controller_controls_operator:** CRH PLC → Stoneco Inc; 2004-07-01 to 2004-11-11; source msha-controller-operator-history
- **operator_operates_mine:** Hanson Aggregates Midwest, LLC → Sylvania Quarry II; 2004-11-12 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hanson PLC → Hanson Aggregates Midwest, LLC; 2004-11-12 to 2007-08-22; source msha-controller-operator-history
- **controller_controls_mine:** Heidelberg Materials AG → Sylvania Quarry II; 2007-08-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Heidelberg Materials AG → Hanson Aggregates Midwest, LLC; 2007-08-23 to current/open; source msha-controller-operator-history