# Relationship history for MSHA mine 0404830

Current hierarchy: **Martin Marietta Materials Inc → Hanson Aggregates LLC → Newberry Springs 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Cal West Rock Products Inc → Newberry Springs Plant; 1986-08-01 to 1993-06-24; source msha-controller-operator-history
- **controller_controls_mine:** Santa Fe Pacific Corp → Newberry Springs Plant; 1986-08-01 to 1993-07-26; source msha-controller-operator-history
- **controller_controls_operator:** Santa Fe Pacific Corp → Cal West Rock Products Inc; 1986-08-01 to 1993-06-24; source msha-controller-operator-history
- **controller_controls_mine:** Hanson PLC → Newberry Springs Plant; 1988-11-14 to 2007-08-22; source msha-controller-operator-history
- **operator_operates_mine:** Hanson Aggregates Wrp Inc → Newberry Springs Plant; 1993-06-25 to 2006-06-12; source msha-controller-operator-history
- **controller_controls_mine:** Hanson PLC → Newberry Springs Plant; 1993-06-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hanson PLC → Hanson Aggregates Wrp Inc; 1993-06-25 to 2006-06-12; source msha-controller-operator-history
- **operator_operates_mine:** Hanson Aggregates LLC → Newberry Springs Plant; 2006-06-13 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hanson PLC → Hanson Aggregates LLC; 2006-06-13 to 2007-08-22; source msha-controller-operator-history
- **controller_controls_mine:** Heidelberg Materials AG → Newberry Springs Plant; 2007-08-23 to 2021-09-30; source msha-controller-operator-history
- **controller_controls_operator:** Heidelberg Materials AG → Hanson Aggregates LLC; 2007-08-23 to 2021-09-30; source msha-controller-operator-history
- **controller_controls_mine:** Martin Marietta Materials Inc → Newberry Springs Plant; 2021-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Martin Marietta Materials Inc → Hanson Aggregates LLC; 2021-10-01 to current/open; source msha-controller-operator-history