# Relationship history for MSHA mine 4402406

Current hierarchy: **Vulcan Materials Company → Vulcan Construction Materials, L.P. → New Post**

- 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) → New Post; 1950-01-01 to 2007-11-15; source msha-controller-operator-history
- **operator_operates_mine:** Massaponax Sand & Gravel Corp → New Post; 1950-01-01 to 1990-07-31; source msha-controller-operator-history
- **controller_controls_mine:** V D  Lucy → New Post; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** V D  Lucy → Massaponax Sand & Gravel Corp; 1950-01-01 to 1990-07-31; source msha-controller-operator-history
- **controller_controls_mine:** Tarmac Plc → New Post; 1988-12-19 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Tarmac Mid-Atlantic Inc → New Post; 1990-08-01 to 2000-10-23; source msha-controller-operator-history
- **controller_controls_operator:** Tarmac Plc → Tarmac Mid-Atlantic Inc; 1990-08-01 to 2000-10-23; source msha-controller-operator-history
- **operator_operates_mine:** Vulcan Construction Materials, L.P. → New Post; 2000-10-24 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Legacy Vulcan Corp (Form:Vulcan Materials Co) → Vulcan Construction Materials, L.P.; 2000-10-24 to 2007-11-15; source msha-controller-operator-history
- **controller_controls_mine:** Vulcan Materials Company → New Post; 2007-11-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Vulcan Materials Company → Vulcan Construction Materials, L.P.; 2007-11-16 to current/open; source msha-controller-operator-history