# Relationship history for MSHA mine 3000794

Current hierarchy: **Vulcan Materials Company → Vulcan Construction Materials, LLC → Coram Materials Corp**

- 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) → Coram Materials Corp; 1950-01-01 to 2007-11-15; source msha-controller-operator-history
- **operator_operates_mine:** Coram Materials Corp → Coram Materials Corp; 1950-01-01 to 2020-02-24; source msha-controller-operator-history
- **controller_controls_mine:** Michael  Vigliarolo → Coram Materials Corp; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Michael  Vigliarolo → Coram Materials Corp; 1950-01-01 to 2020-02-24; source msha-controller-operator-history
- **controller_controls_mine:** US Concrete → Coram Materials Corp; 2002-02-01 to 2021-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Vulcan Materials Company → Coram Materials Corp; 2007-11-16 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Eastern Concrete Materials Inc., → Coram Materials Corp; 2020-02-25 to 2021-12-31; source msha-controller-operator-history
- **controller_controls_operator:** US Concrete → Eastern Concrete Materials Inc.,; 2020-02-25 to 2021-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Vulcan Materials Company → Coram Materials Corp; 2022-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Vulcan Materials Company → Eastern Concrete Materials Inc.,; 2022-01-01 to 2021-12-31; source msha-controller-operator-history
- **operator_operates_mine:** USC Atlantic Inc. → Coram Materials Corp; 2022-01-01 to 2022-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Vulcan Materials Company → USC Atlantic Inc.; 2022-01-01 to 2022-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Vulcan Construction Materials, LLC → Coram Materials Corp; 2023-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Vulcan Materials Company → Vulcan Construction Materials, LLC; 2023-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Legacy Vulcan Corp (Form:Vulcan Materials Co) → Vulcan Construction Materials, LLC; 2023-01-01 to 2007-11-15; source msha-controller-operator-history