# Relationship history for MSHA mine 3000076

Current hierarchy: **Heidelberg Materials AG → Heidelberg Materials Northeast LLC → SCHOHARIE 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Masick Soil Conservation Company → SCHOHARIE QUARRY; 1950-01-01 to 1998-06-07; source msha-controller-operator-history
- **controller_controls_mine:** Albert A  Masick → SCHOHARIE QUARRY; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Albert A  Masick → Masick Soil Conservation Company; 1950-01-01 to 1998-06-07; source msha-controller-operator-history
- **controller_controls_mine:** Hanson PLC → SCHOHARIE QUARRY; 1988-11-14 to 2007-08-22; source msha-controller-operator-history
- **controller_controls_mine:** Carver P  Laraway et al → SCHOHARIE QUARRY; 1995-11-08 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Carver Sand & Gravel LLC → SCHOHARIE QUARRY; 1998-06-08 to 2025-05-19; source msha-controller-operator-history
- **controller_controls_operator:** Carver P  Laraway et al → Carver Sand & Gravel LLC; 1998-06-08 to 2025-05-19; source msha-controller-operator-history
- **controller_controls_mine:** Heidelberg Materials AG → SCHOHARIE QUARRY; 2007-08-23 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Heidelberg Materials Northeast LLC → SCHOHARIE QUARRY; 2025-05-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Heidelberg Materials AG → Heidelberg Materials Northeast LLC; 2025-05-20 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hanson PLC → Heidelberg Materials Northeast LLC; 2025-05-20 to 2007-08-22; source msha-controller-operator-history