# Relationship history for MSHA mine 2800011

Current hierarchy: **Vulcan Materials Company → Vulcan Construction Materials, LLC → Hamburg 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

- **controller_controls_mine:** Legacy Vulcan Corp (Form:Vulcan Materials Co) → Hamburg Quarry; 1950-01-01 to 2007-11-15; source msha-controller-operator-history
- **operator_operates_mine:** Hamburg Quarry Inc → Hamburg Quarry; 1950-01-01 to 1978-12-31; source msha-controller-operator-history
- **controller_controls_mine:** John A  Braen → Hamburg Quarry; 1950-01-01 to 1978-12-31; source msha-controller-operator-history
- **controller_controls_operator:** John A  Braen → Hamburg Quarry Inc; 1950-01-01 to 1978-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Blue Circle-Raia → Hamburg Quarry; 1979-01-01 to 1987-06-30; source msha-controller-operator-history
- **controller_controls_mine:** Joseph  Raia Sr → Hamburg Quarry; 1979-01-01 to 1987-06-30; source msha-controller-operator-history
- **controller_controls_operator:** Joseph  Raia Sr → Blue Circle-Raia; 1979-01-01 to 1987-06-30; source msha-controller-operator-history
- **operator_operates_mine:** Blue Circle Materials Inc → Hamburg Quarry; 1987-07-01 to 2002-01-31; source msha-controller-operator-history
- **controller_controls_mine:** Blue Circle Industries Plc → Hamburg Quarry; 1987-07-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Blue Circle Industries Plc → Blue Circle Materials Inc; 1987-07-01 to 2002-01-31; source msha-controller-operator-history
- **operator_operates_mine:** Eastern Concrete Materials, Inc. → Hamburg Quarry; 2002-02-01 to 2022-12-31; source msha-controller-operator-history
- **controller_controls_mine:** US Concrete → Hamburg Quarry; 2002-02-01 to 2021-12-31; source msha-controller-operator-history
- **controller_controls_operator:** US Concrete → Eastern Concrete Materials, Inc.; 2002-02-01 to 2021-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Vulcan Materials Company → Hamburg Quarry; 2007-11-16 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Vulcan Materials Company → Hamburg Quarry; 2022-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Vulcan Materials Company → Eastern Concrete Materials, Inc.; 2022-01-01 to 2022-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Vulcan Construction Materials, LLC → Hamburg Quarry; 2023-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Vulcan Materials Company → Vulcan Construction Materials, LLC; 2023-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Legacy Vulcan Corp (Form:Vulcan Materials Co) → Vulcan Construction Materials, LLC; 2023-01-01 to 2007-11-15; source msha-controller-operator-history