# Relationship history for MSHA mine 4100120

Current hierarchy: **Vulcan Materials Company → Vulcan Construction Materials, LLC → Weatherford 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) → Weatherford Quarry; 1950-01-01 to 2007-11-15; source msha-controller-operator-history
- **operator_operates_mine:** White'S Mines Inc → Weatherford Quarry; 1950-01-01 to 1987-09-27; source msha-controller-operator-history
- **controller_controls_mine:** R C  Soares → Weatherford Quarry; 1950-01-01 to 1987-09-27; source msha-controller-operator-history
- **controller_controls_operator:** R C  Soares → White'S Mines Inc; 1950-01-01 to 1987-09-27; source msha-controller-operator-history
- **operator_operates_mine:** Vulcan Construction Materials, LLC → Weatherford Quarry; 1987-09-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Legacy Vulcan Corp (Form:Vulcan Materials Co) → Vulcan Construction Materials, LLC; 1987-09-28 to 2007-11-15; source msha-controller-operator-history
- **controller_controls_mine:** Vulcan Materials Company → Weatherford 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