# Relationship history for MSHA mine 3002504

Current hierarchy: **Heidelberg Materials AG → Heidelberg Materials Northeast LLC → Clayton Sand & Gravel**

- 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:** Bach Plmbg & Heating Co of Clayton Inc dba Bach&Co → Clayton Sand & Gravel; 1980-04-01 to 2023-11-29; source msha-controller-operator-history
- **controller_controls_mine:** Karl  Bach → Clayton Sand & Gravel; 1980-04-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Karl  Bach → Bach Plmbg & Heating Co of Clayton Inc dba Bach&Co; 1980-04-01 to 2023-11-29; source msha-controller-operator-history
- **controller_controls_mine:** Hanson PLC → Clayton Sand & Gravel; 1988-11-14 to 2007-08-22; source msha-controller-operator-history
- **controller_controls_mine:** Heidelberg Materials AG → Clayton Sand & Gravel; 2007-08-23 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Heidelberg Materials Northeast - NY LLC → Clayton Sand & Gravel; 2023-11-30 to 2025-12-02; source msha-controller-operator-history
- **controller_controls_operator:** Heidelberg Materials AG → Heidelberg Materials Northeast - NY LLC; 2023-11-30 to 2025-12-02; source msha-controller-operator-history
- **controller_controls_operator:** Hanson PLC → Heidelberg Materials Northeast - NY LLC; 2023-11-30 to 2007-08-22; source msha-controller-operator-history
- **operator_operates_mine:** Heidelberg Materials Northeast LLC → Clayton Sand & Gravel; 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