# Relationship history for MSHA mine 4103963

Current hierarchy: **Martin Marietta Materials Inc → Hanson Aggregates → Conners 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:** Hanson PLC → Conners Plant; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Hanson PLC → Conners Plant; 1988-11-14 to 2007-08-22; source msha-controller-operator-history
- **controller_controls_mine:** Mary  Conners et al → Conners Plant; 1992-05-01 to 2016-08-31; source msha-controller-operator-history
- **operator_operates_mine:** Conners Construction Company Inc → Conners Plant; 1997-05-01 to 1999-09-28; source msha-controller-operator-history
- **controller_controls_operator:** Mary  Conners et al → Conners Construction Company Inc; 1997-05-01 to 1999-09-28; source msha-controller-operator-history
- **operator_operates_mine:** Hanson Aggregates West Inc → Conners Plant; 1999-09-29 to 2004-05-09; source msha-controller-operator-history
- **controller_controls_operator:** Hanson PLC → Hanson Aggregates West Inc; 1999-09-29 to 2004-05-09; source msha-controller-operator-history
- **operator_operates_mine:** Hanson Aggregates → Conners Plant; 2004-05-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hanson PLC → Hanson Aggregates; 2004-05-10 to 2007-08-22; source msha-controller-operator-history
- **controller_controls_mine:** Heidelberg Materials AG → Conners Plant; 2007-08-23 to 2021-09-30; source msha-controller-operator-history
- **controller_controls_operator:** Heidelberg Materials AG → Hanson Aggregates; 2007-08-23 to 2021-09-30; source msha-controller-operator-history
- **controller_controls_mine:** Estate of Gary Conners et al → Conners Plant; 2016-09-01 to 2018-03-28; source msha-controller-operator-history
- **controller_controls_operator:** Estate of Gary Conners et al → Conners Construction Company Inc; 2016-09-01 to 1999-09-28; source msha-controller-operator-history
- **controller_controls_operator:** Jeff  Conners et al → Conners Construction Company Inc; 2016-09-01 to 1999-09-28; source msha-controller-operator-history
- **controller_controls_operator:** Pam  Conners et al → Conners Construction Company Inc; 2016-09-01 to 1999-09-28; source msha-controller-operator-history
- **controller_controls_mine:** Scott  Conners Et Al → Conners Plant; 2018-03-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Scott  Conners Et Al → Conners Construction Company Inc; 2018-03-29 to 1999-09-28; source msha-controller-operator-history
- **controller_controls_operator:** Jeff  Conners Et Al → Conners Construction Company Inc; 2018-03-29 to 1999-09-28; source msha-controller-operator-history
- **controller_controls_operator:** Pam  Conners Et Al → Conners Construction Company Inc; 2018-03-29 to 1999-09-28; source msha-controller-operator-history
- **controller_controls_mine:** Martin Marietta Materials Inc → Conners Plant; 2021-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Martin Marietta Materials Inc → Hanson Aggregates; 2021-10-01 to current/open; source msha-controller-operator-history