# Relationship history for MSHA mine 3600052

Current hierarchy: **Heidelberg Materials AG → Heidelberg Materials Northeast LLC → Plymouth Meeting 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:** G & W H Corson Inc → Plymouth Meeting Quarry; 1950-01-01 to 1981-09-22; source msha-controller-operator-history
- **controller_controls_mine:** Iu Industrials Inc → Plymouth Meeting Quarry; 1950-01-01 to 1981-09-22; source msha-controller-operator-history
- **controller_controls_operator:** Iu Industrials Inc → G & W H Corson Inc; 1950-01-01 to 1981-09-22; source msha-controller-operator-history
- **controller_controls_mine:** Peter DePaul Irrevocable Combined Trust → Plymouth Meeting Quarry; 1950-01-01 to 2024-07-31; source msha-controller-operator-history
- **operator_operates_mine:** Corson Lime Company → Plymouth Meeting Quarry; 1981-09-23 to 1989-08-19; source msha-controller-operator-history
- **controller_controls_mine:** Rangaire Corp → Plymouth Meeting Quarry; 1981-09-23 to 1989-08-19; source msha-controller-operator-history
- **controller_controls_operator:** Rangaire Corp → Corson Lime Company; 1981-09-23 to 1989-08-19; source msha-controller-operator-history
- **controller_controls_mine:** Hanson PLC → Plymouth Meeting Quarry; 1988-11-14 to 2007-08-22; source msha-controller-operator-history
- **operator_operates_mine:** Corson Lime Company → Plymouth Meeting Quarry; 1989-08-20 to 1997-06-20; source msha-controller-operator-history
- **controller_controls_mine:** United States Lime & Minerals Inc → Plymouth Meeting Quarry; 1989-08-20 to 1997-06-20; source msha-controller-operator-history
- **controller_controls_operator:** United States Lime & Minerals Inc → Corson Lime Company; 1989-08-20 to 1997-06-20; source msha-controller-operator-history
- **operator_operates_mine:** Highway Materials LLC → Plymouth Meeting Quarry; 1997-06-21 to 2025-04-30; source msha-controller-operator-history
- **controller_controls_operator:** Peter DePaul Irrevocable Combined Trust → Highway Materials LLC; 1997-06-21 to 2024-07-31; source msha-controller-operator-history
- **controller_controls_mine:** Heidelberg Materials AG → Plymouth Meeting Quarry; 2007-08-23 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Heidelberg Materials AG → Plymouth Meeting Quarry; 2024-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Heidelberg Materials AG → Highway Materials LLC; 2024-08-01 to 2025-04-30; source msha-controller-operator-history
- **operator_operates_mine:** Heidelberg Materials Northeast LLC → Plymouth Meeting Quarry; 2025-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Heidelberg Materials AG → Heidelberg Materials Northeast LLC; 2025-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hanson PLC → Heidelberg Materials Northeast LLC; 2025-05-01 to 2007-08-22; source msha-controller-operator-history