# Relationship history for MSHA mine 0100846

Current hierarchy: **Vulcan Materials Company → Vulcan Materials Company → Florette Plant**

- 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) → Florette Plant; 1950-01-01 to 2007-11-15; source msha-controller-operator-history
- **operator_operates_mine:** Trinity Quarries Inc → Florette Plant; 1950-01-01 to 1981-03-27; source msha-controller-operator-history
- **controller_controls_mine:** W J  Crowe → Florette Plant; 1950-01-01 to 1981-03-27; source msha-controller-operator-history
- **controller_controls_operator:** W J  Crowe → Trinity Quarries Inc; 1950-01-01 to 1981-03-27; source msha-controller-operator-history
- **operator_operates_mine:** Vulcan Materials Company → Florette Plant; 1981-03-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Legacy Vulcan Corp (Form:Vulcan Materials Co) → Vulcan Materials Company; 1981-03-28 to 2007-11-15; source msha-controller-operator-history
- **controller_controls_mine:** Vulcan Materials Company → Florette Plant; 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