# Relationship history for MSHA mine 1202127

Current hierarchy: **Vigo Coal Company Incorporated → Vigo Coal Company Inc → Columbia Mine**

- Valid-time bounds: inclusive, date granularity
- Null end: open-ended in the upstream history row; not independent proof of present control
- Transaction-time observation: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Vigo Coal Company Incorporated → Columbia Mine; 1985-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Vigo Coal Company Inc → Columbia Mine; 1992-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Vigo Coal Company Incorporated → Vigo Coal Company Inc; 1992-05-01 to current/open; source msha-controller-operator-history