# Relationship history for MSHA mine 1202037

Current hierarchy: **Vulcan Materials Company → Vulcan Materials Company → HARNER PIT**

- 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) → HARNER PIT; 1950-01-01 to 2007-11-15; source msha-controller-operator-history
- **controller_controls_mine:** John O  Coffin → HARNER PIT; 1950-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Fairfield Builders Supply Corp → HARNER PIT; 1988-10-01 to 1995-08-31; source msha-controller-operator-history
- **controller_controls_operator:** John O  Coffin → Fairfield Builders Supply Corp; 1988-10-01 to 1995-08-31; source msha-controller-operator-history
- **operator_operates_mine:** Vulcan Materials Company → HARNER PIT; 1995-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Legacy Vulcan Corp (Form:Vulcan Materials Co) → Vulcan Materials Company; 1995-09-01 to 2007-11-15; source msha-controller-operator-history
- **controller_controls_mine:** Vulcan Materials Company → HARNER PIT; 2007-11-16 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Vulcan Materials Company → Vulcan Materials Company; 2007-11-16 to current/open; source msha-controller-operator-history