# Relationship history for MSHA mine 4103154

Current hierarchy: **Vulcan Materials Company → Vulcan Construction Materials, LLC → Shower's 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) → Shower's Plant; 1950-01-01 to 2007-11-15; source msha-controller-operator-history
- **controller_controls_mine:** Robert W  Briggs → Shower's Plant; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Central Caliche Products → Shower's Plant; 1983-02-01 to 1988-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Joe  Airhart  et al → Shower's Plant; 1983-02-01 to 1988-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Joe  Airhart  et al → Central Caliche Products; 1983-02-01 to 1988-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Fordyce Holdings Inc → Shower's Plant; 1989-01-01 to 2022-02-27; source msha-controller-operator-history
- **controller_controls_operator:** Robert W  Briggs → Fordyce Holdings Inc; 1989-01-01 to 2022-02-27; source msha-controller-operator-history
- **controller_controls_mine:** Vulcan Materials Company → Shower's Plant; 2007-11-16 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Vulcan Construction Materials, LLC → Shower's 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