# Relationship history for MSHA mine 3605953

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

## Valid-time edges

- **operator_operates_mine:** Fishing Creek Construction Company → Bloomsburg Quarry; 1950-01-01 to 1978-05-16; source msha-controller-operator-history
- **controller_controls_mine:** Fishing Creek Construction Company → Bloomsburg Quarry; 1950-01-01 to 1978-05-16; source msha-controller-operator-history
- **controller_controls_operator:** Fishing Creek Construction Company → Fishing Creek Construction Company; 1950-01-01 to 1978-05-16; source msha-controller-operator-history
- **operator_operates_mine:** Columbia Asphalt Corp → Bloomsburg Quarry; 1978-05-17 to 1989-01-25; source msha-controller-operator-history
- **controller_controls_mine:** Terry W  Hock → Bloomsburg Quarry; 1978-05-17 to 1989-01-25; source msha-controller-operator-history
- **controller_controls_operator:** Terry W  Hock → Columbia Asphalt Corp; 1978-05-17 to 1989-01-25; source msha-controller-operator-history
- **controller_controls_mine:** Hanson PLC → Bloomsburg Quarry; 1988-11-14 to 2007-08-22; source msha-controller-operator-history
- **operator_operates_mine:** Heidelberg Materials Northeast LLC → Bloomsburg Quarry; 1989-01-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Hanson PLC → Heidelberg Materials Northeast LLC; 1989-01-26 to 2007-08-22; source msha-controller-operator-history
- **controller_controls_mine:** Heidelberg Materials AG → Bloomsburg Quarry; 2007-08-23 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Heidelberg Materials AG → Heidelberg Materials Northeast LLC; 2007-08-23 to current/open; source msha-controller-operator-history