# Relationship history for MSHA mine 1302066

Current hierarchy: **Vulcan Materials Company → Vulcan Materials Company → Stripping Crew**

- 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) → Stripping Crew; 1950-01-01 to 2007-11-15; source msha-controller-operator-history
- **controller_controls_mine:** B L Anderson Inc → Stripping Crew; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** B L Anderson Inc → Stripping Crew; 1985-06-01 to 1988-05-31; source msha-controller-operator-history
- **controller_controls_operator:** B L Anderson Inc → B L Anderson Inc; 1985-06-01 to 1988-05-31; source msha-controller-operator-history
- **operator_operates_mine:** Vulcan Materials Company → Stripping Crew; 1988-06-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Legacy Vulcan Corp (Form:Vulcan Materials Co) → Vulcan Materials Company; 1988-06-01 to 2007-11-15; source msha-controller-operator-history
- **controller_controls_mine:** Vulcan Materials Company → Stripping Crew; 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