# Relationship history for MSHA mine 4404730

Current hierarchy: **Vulcan Materials Company → Vulcan Materials Company → Linden 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Legacy Vulcan Corp (Form:Vulcan Materials Co) → Linden Quarry; 1950-01-01 to 2007-11-15; source msha-controller-operator-history
- **controller_controls_mine:** W W  Sanders Jr → Linden Quarry; 1950-01-01 to 1987-10-30; source msha-controller-operator-history
- **operator_operates_mine:** Moore Brothers Company Inc → Linden Quarry; 1950-01-01 to 1979-07-20; source msha-controller-operator-history
- **controller_controls_mine:** Moore Brothers Company Inc → Linden Quarry; 1950-01-01 to 1979-07-20; source msha-controller-operator-history
- **controller_controls_operator:** Moore Brothers Company Inc → Moore Brothers Company Inc; 1950-01-01 to 1979-07-20; source msha-controller-operator-history
- **operator_operates_mine:** Sanders Quarry Inc → Linden Quarry; 1979-07-21 to 1987-10-30; source msha-controller-operator-history
- **controller_controls_operator:** W W  Sanders Jr → Sanders Quarry Inc; 1979-07-21 to 1987-10-30; source msha-controller-operator-history
- **operator_operates_mine:** Vulcan Materials Company → Linden Quarry; 1987-10-31 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Legacy Vulcan Corp (Form:Vulcan Materials Co) → Vulcan Materials Company; 1987-10-31 to 2007-11-15; source msha-controller-operator-history
- **controller_controls_mine:** Vulcan Materials Company → Linden Quarry; 2007-11-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Vulcan Materials Company → Vulcan Materials Company; 2007-11-16 to current/open; source msha-controller-operator-history