# Relationship history for MSHA mine 3401820

Current hierarchy: **Vulcan Materials Company → Vulcan Construction Materials, LLC → Vernon S&G**

- 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) → Vernon S&G; 1950-01-01 to 2007-11-15; source msha-controller-operator-history
- **controller_controls_mine:** Zack  Burkett III → Vernon S&G; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** John M  Pitts  et al → Vernon S&G; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** E & A Materials Inc → Vernon S&G; 1999-02-01 to 2015-08-29; source msha-controller-operator-history
- **controller_controls_operator:** John M  Pitts  et al → E & A Materials Inc; 1999-02-01 to 2015-08-29; source msha-controller-operator-history
- **controller_controls_mine:** Vulcan Materials Company → Vernon S&G; 2007-11-16 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** US Concrete → Vernon S&G; 2008-03-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Ingram Concrete LLC → Vernon S&G; 2015-08-30 to 2016-01-06; source msha-controller-operator-history
- **controller_controls_operator:** US Concrete → Ingram Concrete LLC; 2015-08-30 to 2016-01-06; source msha-controller-operator-history
- **operator_operates_mine:** Zack Burkett Co → Vernon S&G; 2016-01-07 to 2023-04-20; source msha-controller-operator-history
- **controller_controls_operator:** Zack  Burkett III → Zack Burkett Co; 2016-01-07 to 2023-04-20; source msha-controller-operator-history
- **operator_operates_mine:** Vulcan Construction Materials, LLC → Vernon S&G; 2023-04-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Vulcan Materials Company → Vulcan Construction Materials, LLC; 2023-04-21 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Legacy Vulcan Corp (Form:Vulcan Materials Co) → Vulcan Construction Materials, LLC; 2023-04-21 to 2007-11-15; source msha-controller-operator-history