# Relationship history for MSHA mine 3600036

Current hierarchy: **Heidelberg Materials AG → Heidelberg Materials Northeast LLC → Ottsville 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:** Bucks County Crushed Stone Inc → Ottsville Quarry; 1950-01-01 to 1984-10-31; source msha-controller-operator-history
- **controller_controls_mine:** Benjamin R  Scholl → Ottsville Quarry; 1950-01-01 to 1984-10-31; source msha-controller-operator-history
- **controller_controls_operator:** Benjamin R  Scholl → Bucks County Crushed Stone Inc; 1950-01-01 to 1984-10-31; source msha-controller-operator-history
- **operator_operates_mine:** Bucks County Crushed Stone → Ottsville Quarry; 1984-11-01 to 1998-12-14; source msha-controller-operator-history
- **controller_controls_mine:** Arlene E  Kraus → Ottsville Quarry; 1984-11-01 to 1998-12-14; source msha-controller-operator-history
- **controller_controls_operator:** Arlene E  Kraus → Bucks County Crushed Stone; 1984-11-01 to 1998-12-14; source msha-controller-operator-history
- **controller_controls_mine:** Hanson PLC → Ottsville Quarry; 1988-11-14 to 2007-08-22; source msha-controller-operator-history
- **controller_controls_mine:** USS Holdings Inc → Ottsville Quarry; 1996-03-09 to 2003-07-18; source msha-controller-operator-history
- **operator_operates_mine:** Hanson Aggregates BMC, Inc. → Ottsville Quarry; 1998-12-15 to 2022-04-28; source msha-controller-operator-history
- **controller_controls_operator:** USS Holdings Inc → Hanson Aggregates BMC, Inc.; 1998-12-15 to 2003-07-18; source msha-controller-operator-history
- **controller_controls_mine:** Hanson PLC → Ottsville Quarry; 2003-07-19 to 2007-08-22; source msha-controller-operator-history
- **controller_controls_operator:** Hanson PLC → Hanson Aggregates BMC, Inc.; 2003-07-19 to 2007-08-22; source msha-controller-operator-history
- **controller_controls_mine:** Heidelberg Materials AG → Ottsville Quarry; 2007-08-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Heidelberg Materials AG → Hanson Aggregates BMC, Inc.; 2007-08-23 to 2022-04-28; source msha-controller-operator-history
- **operator_operates_mine:** Heidelberg Materials Northeast LLC → Ottsville Quarry; 2022-04-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Heidelberg Materials AG → Heidelberg Materials Northeast LLC; 2022-04-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hanson PLC → Heidelberg Materials Northeast LLC; 2022-04-29 to 2007-08-22; source msha-controller-operator-history