# Relationship history for MSHA mine 4101072

Current hierarchy: **Vulcan Materials Company → Vulcan Construction Materials, LLC → Briggs 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Legacy Vulcan Corp (Form:Vulcan Materials Co) → Briggs Plant; 1950-01-01 to 2007-11-15; source msha-controller-operator-history
- **operator_operates_mine:** Fordyce Company → Briggs Plant; 1950-01-01 to 2004-03-25; source msha-controller-operator-history
- **controller_controls_mine:** Robert W  Briggs → Briggs Plant; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert W  Briggs → Fordyce Company; 1950-01-01 to 2004-03-25; source msha-controller-operator-history
- **operator_operates_mine:** Fordyce,Ltd. → Briggs Plant; 2004-03-26 to 2009-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Robert W  Briggs → Briggs Plant; 2004-03-26 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert W  Briggs → Fordyce,Ltd.; 2004-03-26 to 2009-03-31; source msha-controller-operator-history
- **controller_controls_mine:** Vulcan Materials Company → Briggs Plant; 2007-11-16 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Fordyce Holdings Inc → Briggs Plant; 2009-04-01 to 2022-02-27; source msha-controller-operator-history
- **controller_controls_operator:** Robert W  Briggs → Fordyce Holdings Inc; 2009-04-01 to 2022-02-27; source msha-controller-operator-history
- **operator_operates_mine:** Vulcan Construction Materials, LLC → Briggs Plant; 2022-02-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Vulcan Materials Company → Vulcan Construction Materials, LLC; 2022-02-28 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Legacy Vulcan Corp (Form:Vulcan Materials Co) → Vulcan Construction Materials, LLC; 2022-02-28 to 2007-11-15; source msha-controller-operator-history