# Relationship history for MSHA mine 0901053

Current hierarchy: **Vulcan Materials Company → Vulcan Construction Materials, L.P. → HEARD COUNTY 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) → HEARD COUNTY QUARRY; 1950-01-01 to 2007-11-15; source msha-controller-operator-history
- **operator_operates_mine:** Capitol Stone Inc → HEARD COUNTY QUARRY; 1990-06-01 to 1991-12-02; source msha-controller-operator-history
- **controller_controls_mine:** William  Carpenter → HEARD COUNTY QUARRY; 1990-06-01 to 1991-12-02; source msha-controller-operator-history
- **controller_controls_operator:** William  Carpenter → Capitol Stone Inc; 1990-06-01 to 1991-12-02; source msha-controller-operator-history
- **operator_operates_mine:** Capitol Rock Inc → HEARD COUNTY QUARRY; 1991-12-03 to 1997-10-15; source msha-controller-operator-history
- **controller_controls_mine:** A C  Boyd → HEARD COUNTY QUARRY; 1991-12-03 to 1997-10-15; source msha-controller-operator-history
- **controller_controls_operator:** A C  Boyd → Capitol Rock Inc; 1991-12-03 to 1997-10-15; source msha-controller-operator-history
- **operator_operates_mine:** Vulcan Construction Materials, L.P. → HEARD COUNTY QUARRY; 1997-10-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Legacy Vulcan Corp (Form:Vulcan Materials Co) → Vulcan Construction Materials, L.P.; 1997-10-16 to 2007-11-15; source msha-controller-operator-history
- **controller_controls_mine:** Vulcan Materials Company → HEARD COUNTY QUARRY; 2007-11-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Vulcan Materials Company → Vulcan Construction Materials, L.P.; 2007-11-16 to current/open; source msha-controller-operator-history