# Relationship history for MSHA mine 0301750

Current hierarchy: **Vulcan Materials Company → Vulcan Construction Materials, LLC → Floyd 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) → Floyd Quarry; 1950-01-01 to 2007-11-15; source msha-controller-operator-history
- **controller_controls_mine:** Larry  Duffield et al → Floyd Quarry; 1992-05-31 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** L & R Quarries Inc → Floyd Quarry; 1994-05-01 to 1997-05-29; source msha-controller-operator-history
- **controller_controls_operator:** Larry  Duffield et al → L & R Quarries Inc; 1994-05-01 to 1997-05-29; source msha-controller-operator-history
- **controller_controls_operator:** Randy  Duffield et al → L & R Quarries Inc; 1994-05-01 to 1997-05-29; source msha-controller-operator-history
- **operator_operates_mine:** Vulcan Construction Materials, LLC → Floyd Quarry; 1997-05-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Legacy Vulcan Corp (Form:Vulcan Materials Co) → Vulcan Construction Materials, LLC; 1997-05-30 to 2007-11-15; source msha-controller-operator-history
- **controller_controls_mine:** Vulcan Materials Company → Floyd 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