# Relationship history for MSHA mine 1201727

Current hierarchy: **Vigo Coal Company Incorporated → Southern Indiana Dock Inc → Southern Indiana Dock Inc**

- 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

- **operator_operates_mine:** National Dock Corp → Southern Indiana Dock Inc; 1979-08-01 to 1981-12-30; source msha-controller-operator-history
- **controller_controls_mine:** Mel (Van)  Villines → Southern Indiana Dock Inc; 1979-08-01 to 1981-12-30; source msha-controller-operator-history
- **controller_controls_operator:** Mel (Van)  Villines → National Dock Corp; 1979-08-01 to 1981-12-30; source msha-controller-operator-history
- **operator_operates_mine:** National Dock Corp → Southern Indiana Dock Inc; 1981-12-31 to 1984-10-24; source msha-controller-operator-history
- **controller_controls_mine:** Teeter Harold R → Southern Indiana Dock Inc; 1981-12-31 to 1984-10-24; source msha-controller-operator-history
- **controller_controls_operator:** Teeter Harold R → National Dock Corp; 1981-12-31 to 1984-10-24; source msha-controller-operator-history
- **operator_operates_mine:** Southern Indiana Dock Inc → Southern Indiana Dock Inc; 1984-10-25 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Vigo Coal Company Incorporated → Southern Indiana Dock Inc; 1984-10-25 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Vigo Coal Company Incorporated → Southern Indiana Dock Inc; 1984-10-25 to current/open; source msha-controller-operator-history