# Relationship history for MSHA mine 0402828

Current hierarchy: **Penny J  Holliday → Holliday Rock Company → Upland 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:** Penny J  Holliday et al → Upland Plant; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Calmat Company → Upland Plant; 1950-01-01 to 1999-01-05; source msha-controller-operator-history
- **controller_controls_mine:** Calmat Company → Upland Plant; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Calmat Company → Calmat Company; 1950-01-01 to 1999-01-05; source msha-controller-operator-history
- **operator_operates_mine:** CalMat Co → Upland Plant; 1999-01-06 to 2011-11-30; source msha-controller-operator-history
- **controller_controls_mine:** Legacy Vulcan Corp (Form:Vulcan Materials Co) → Upland Plant; 1999-01-06 to 2007-11-15; source msha-controller-operator-history
- **controller_controls_operator:** Legacy Vulcan Corp (Form:Vulcan Materials Co) → CalMat Co; 1999-01-06 to 2007-11-15; source msha-controller-operator-history
- **controller_controls_mine:** Vulcan Materials Company → Upland Plant; 2007-11-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Vulcan Materials Company → CalMat Co; 2007-11-16 to 2011-11-30; source msha-controller-operator-history
- **operator_operates_mine:** Holliday Rock Company → Upland Plant; 2011-12-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Penny J  Holliday et al → Holliday Rock Company; 2011-12-01 to current/open; source msha-controller-operator-history