# Relationship history for MSHA mine 1500016

Current hierarchy: **Vulcan Materials Company → Vulcan Construction Materials, LLC → Central 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) → Central Quarry; 1950-01-01 to 2007-11-15; source msha-controller-operator-history
- **operator_operates_mine:** Central Rock Company → Central Quarry; 1950-01-01 to 1982-11-30; source msha-controller-operator-history
- **controller_controls_mine:** George G  Brown → Central Quarry; 1950-01-01 to 1982-11-30; source msha-controller-operator-history
- **controller_controls_operator:** George G  Brown → Central Rock Company; 1950-01-01 to 1982-11-30; source msha-controller-operator-history
- **operator_operates_mine:** Central Rock Minerals Corp → Central Quarry; 1982-12-01 to 1989-03-29; source msha-controller-operator-history
- **controller_controls_mine:** Harold  Watts → Central Quarry; 1982-12-01 to 1989-03-29; source msha-controller-operator-history
- **controller_controls_operator:** Harold  Watts → Central Rock Minerals Corp; 1982-12-01 to 1989-03-29; source msha-controller-operator-history
- **operator_operates_mine:** Vulcan Construction Materials, LLC → Central Quarry; 1989-03-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Legacy Vulcan Corp (Form:Vulcan Materials Co) → Vulcan Construction Materials, LLC; 1989-03-30 to 2007-11-15; source msha-controller-operator-history
- **controller_controls_mine:** Vulcan Materials Company → Central Quarry; 2007-11-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Vulcan Materials Company → Vulcan Construction Materials, LLC; 2007-11-16 to current/open; source msha-controller-operator-history