# Relationship history for MSHA mine 3002600

Current hierarchy: **Heidelberg Materials AG → Heidelberg Materials Northeast LLC → Marcellus Quarry**

- 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:** Michael T  Saunders → Marcellus Quarry; 1950-01-01 to 2014-01-28; source msha-controller-operator-history
- **operator_operates_mine:** W F Saunders & Sons Inc → Marcellus Quarry; 1981-06-01 to 2017-08-27; source msha-controller-operator-history
- **controller_controls_operator:** Michael T  Saunders → W F Saunders & Sons Inc; 1981-06-01 to 2014-01-28; source msha-controller-operator-history
- **controller_controls_mine:** Hanson PLC → Marcellus Quarry; 1988-11-14 to 2007-08-22; source msha-controller-operator-history
- **controller_controls_mine:** Heidelberg Materials AG → Marcellus Quarry; 2007-08-23 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Tracy  Saunders → Marcellus Quarry; 2014-01-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Tracy  Saunders → W F Saunders & Sons Inc; 2014-01-29 to 2017-08-27; source msha-controller-operator-history
- **operator_operates_mine:** Heidelberg Materials Northeast-NY LLC → Marcellus Quarry; 2017-08-28 to 2025-12-02; source msha-controller-operator-history
- **controller_controls_operator:** Heidelberg Materials AG → Heidelberg Materials Northeast-NY LLC; 2017-08-28 to 2025-12-02; source msha-controller-operator-history
- **controller_controls_operator:** Hanson PLC → Heidelberg Materials Northeast-NY LLC; 2017-08-28 to 2007-08-22; source msha-controller-operator-history
- **operator_operates_mine:** Heidelberg Materials Northeast LLC → Marcellus Quarry; 2025-12-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Heidelberg Materials AG → Heidelberg Materials Northeast LLC; 2025-12-03 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hanson PLC → Heidelberg Materials Northeast LLC; 2025-12-03 to 2007-08-22; source msha-controller-operator-history