# Relationship history for MSHA mine 0100037

Current hierarchy: **Vulcan Materials Company → Vulcan Construction Materials, LLC → CHILDERSBURG 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) → CHILDERSBURG QUARRY; 1950-01-01 to 2007-11-15; source msha-controller-operator-history
- **operator_operates_mine:** Lambert Materials Company Inc → CHILDERSBURG QUARRY; 1950-01-01 to 1984-10-31; source msha-controller-operator-history
- **controller_controls_mine:** John M  Lambert Jr → CHILDERSBURG QUARRY; 1950-01-01 to 1984-10-31; source msha-controller-operator-history
- **controller_controls_operator:** John M  Lambert Jr → Lambert Materials Company Inc; 1950-01-01 to 1984-10-31; source msha-controller-operator-history
- **operator_operates_mine:** Vulcan Construction Materials, LLC → CHILDERSBURG QUARRY; 1984-11-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Legacy Vulcan Corp (Form:Vulcan Materials Co) → Vulcan Construction Materials, LLC; 1984-11-01 to 2007-11-15; source msha-controller-operator-history
- **controller_controls_mine:** Vulcan Materials Company → CHILDERSBURG 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