# Relationship history for MSHA mine 3800340

Current hierarchy: **Vulcan Materials Company → Vulcan Construction Materials, LLC → ANDERSON 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) → ANDERSON QUARRY; 1950-01-01 to 2007-11-15; source msha-controller-operator-history
- **operator_operates_mine:** Tribble Construction Company → ANDERSON QUARRY; 1950-01-01 to 1988-09-19; source msha-controller-operator-history
- **controller_controls_mine:** Rufus B  Tribble → ANDERSON QUARRY; 1950-01-01 to 1988-09-19; source msha-controller-operator-history
- **controller_controls_operator:** Rufus B  Tribble → Tribble Construction Company; 1950-01-01 to 1988-09-19; source msha-controller-operator-history
- **operator_operates_mine:** Pioneer Concrete South Carolina Inc → ANDERSON QUARRY; 1988-09-20 to 1992-11-06; source msha-controller-operator-history
- **controller_controls_mine:** Pioneer International Ltd → ANDERSON QUARRY; 1988-09-20 to 1992-11-06; source msha-controller-operator-history
- **controller_controls_operator:** Pioneer International Ltd → Pioneer Concrete South Carolina Inc; 1988-09-20 to 1992-11-06; source msha-controller-operator-history
- **operator_operates_mine:** Vulcan Construction Materials, LLC → ANDERSON QUARRY; 1992-11-07 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Legacy Vulcan Corp (Form:Vulcan Materials Co) → Vulcan Construction Materials, LLC; 1992-11-07 to 2007-11-15; source msha-controller-operator-history
- **controller_controls_mine:** Vulcan Materials Company → ANDERSON 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