# Relationship history for MSHA mine 0301801

Current hierarchy: **Vulcan Materials Company → Vulcan Construction Materials, LLC → Portable Plant #2**

- 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) → Portable Plant #2; 1950-01-01 to 2007-11-15; source msha-controller-operator-history
- **controller_controls_mine:** Bill L  Johnston → Portable Plant #2; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Rock Products Inc → Portable Plant #2; 1998-10-01 to 1999-02-07; source msha-controller-operator-history
- **controller_controls_operator:** Bill L  Johnston → Rock Products Inc; 1998-10-01 to 1999-02-07; source msha-controller-operator-history
- **operator_operates_mine:** Vulcan Constr. Materials, L.P. → Portable Plant #2; 1999-02-08 to 2002-05-09; source msha-controller-operator-history
- **controller_controls_operator:** Legacy Vulcan Corp (Form:Vulcan Materials Co) → Vulcan Constr. Materials, L.P.; 1999-02-08 to 2002-05-09; source msha-controller-operator-history
- **operator_operates_mine:** Vulcan Materials Company → Portable Plant #2; 2002-05-10 to 2015-06-29; source msha-controller-operator-history
- **controller_controls_operator:** Legacy Vulcan Corp (Form:Vulcan Materials Co) → Vulcan Materials Company; 2002-05-10 to 2007-11-15; source msha-controller-operator-history
- **controller_controls_mine:** Vulcan Materials Company → Portable Plant #2; 2007-11-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Vulcan Materials Company → Vulcan Constr. Materials, L.P.; 2007-11-16 to 2002-05-09; source msha-controller-operator-history
- **controller_controls_operator:** Vulcan Materials Company → Vulcan Materials Company; 2007-11-16 to 2015-06-29; source msha-controller-operator-history
- **operator_operates_mine:** Vulcan Construction Materials, LLC → Portable Plant #2; 2015-06-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Vulcan Materials Company → Vulcan Construction Materials, LLC; 2015-06-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Legacy Vulcan Corp (Form:Vulcan Materials Co) → Vulcan Construction Materials, LLC; 2015-06-30 to 2007-11-15; source msha-controller-operator-history