# Relationship history for MSHA mine 3000052

Current hierarchy: **Heidelberg Materials AG → Heidelberg Materials Northeast LLC → Skaneateles 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** General Crushed Stone Company → Skaneateles Plant; 1950-01-01 to 1988-11-13; source msha-controller-operator-history
- **controller_controls_mine:** Koppers Company Inc → Skaneateles Plant; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Koppers Company Inc → General Crushed Stone Company; 1950-01-01 to 1988-11-13; source msha-controller-operator-history
- **operator_operates_mine:** Hanson Aggregates New York Inc → Skaneateles Plant; 1988-11-14 to 2004-04-05; source msha-controller-operator-history
- **controller_controls_mine:** Hanson PLC → Skaneateles Plant; 1988-11-14 to 2007-08-22; source msha-controller-operator-history
- **controller_controls_operator:** Hanson PLC → Hanson Aggregates New York Inc; 1988-11-14 to 2004-04-05; source msha-controller-operator-history
- **operator_operates_mine:** Hanson Aggregates Inc → Skaneateles Plant; 2004-04-06 to 2004-06-10; source msha-controller-operator-history
- **controller_controls_operator:** Hanson PLC → Hanson Aggregates Inc; 2004-04-06 to 2004-06-10; source msha-controller-operator-history
- **operator_operates_mine:** Heidelberg Materials Northeast-NY LLC → Skaneateles Plant; 2004-06-11 to 2025-12-02; source msha-controller-operator-history
- **controller_controls_operator:** Hanson PLC → Heidelberg Materials Northeast-NY LLC; 2004-06-11 to 2007-08-22; source msha-controller-operator-history
- **controller_controls_mine:** Heidelberg Materials AG → Skaneateles Plant; 2007-08-23 to 2021-09-30; source msha-controller-operator-history
- **controller_controls_operator:** Heidelberg Materials AG → Hanson Aggregates Inc; 2007-08-23 to 2004-06-10; source msha-controller-operator-history
- **controller_controls_mine:** Heidelberg Materials AG → Skaneateles Plant; 2007-08-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Heidelberg Materials AG → Hanson Aggregates New York Inc; 2007-08-23 to 2004-04-05; source msha-controller-operator-history
- **controller_controls_operator:** Heidelberg Materials AG → Heidelberg Materials Northeast-NY LLC; 2007-08-23 to 2025-12-02; source msha-controller-operator-history
- **controller_controls_mine:** Martin Marietta Materials Inc → Skaneateles Plant; 2021-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Martin Marietta Materials Inc → Hanson Aggregates Inc; 2021-10-01 to 2004-06-10; source msha-controller-operator-history
- **operator_operates_mine:** Heidelberg Materials Northeast LLC → Skaneateles Plant; 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