# Relationship history for MSHA mine 4103217

Current hierarchy: **Heidelberg Materials AG → Heidelberg Materials Southwest LLC → WHITNEY**

- 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:** Whitney Sand & Gravel Inc → WHITNEY; 1984-02-01 to 1986-08-13; source msha-controller-operator-history
- **controller_controls_mine:** John R  Marriott et al → WHITNEY; 1984-02-01 to 1986-08-13; source msha-controller-operator-history
- **controller_controls_operator:** John R  Marriott et al → Whitney Sand & Gravel Inc; 1984-02-01 to 1986-08-13; source msha-controller-operator-history
- **operator_operates_mine:** Tufco Ready Mix Inc → WHITNEY; 1986-08-14 to 2000-10-09; source msha-controller-operator-history
- **controller_controls_mine:** Linda  Tufts → WHITNEY; 1986-08-14 to 2000-10-09; source msha-controller-operator-history
- **controller_controls_operator:** Linda  Tufts → Tufco Ready Mix Inc; 1986-08-14 to 2000-10-09; source msha-controller-operator-history
- **controller_controls_mine:** Hanson PLC → WHITNEY; 1988-11-14 to 2007-08-22; source msha-controller-operator-history
- **controller_controls_mine:** Hanson PLC → WHITNEY; 2000-08-04 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Hanson Aggregates Central Inc → WHITNEY; 2000-10-10 to 2004-05-09; source msha-controller-operator-history
- **controller_controls_operator:** Hanson PLC → Hanson Aggregates Central Inc; 2000-10-10 to 2004-05-09; source msha-controller-operator-history
- **operator_operates_mine:** Hanson Aggregates LLC → WHITNEY; 2004-05-10 to 2020-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Hanson PLC → Hanson Aggregates LLC; 2004-05-10 to 2007-08-22; source msha-controller-operator-history
- **controller_controls_mine:** Heidelberg Materials AG → WHITNEY; 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 2020-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Heidelberg Materials Southwest LLC → WHITNEY; 2021-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Heidelberg Materials AG → WHITNEY; 2021-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Heidelberg Materials AG → Heidelberg Materials Southwest LLC; 2021-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Martin Marietta Materials Inc → WHITNEY; 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 2020-12-31; source msha-controller-operator-history