# Relationship history for MSHA mine 4604147

Current hierarchy: **Nelson Joseph W → Sugar Creek Coal Company Inc → No 1 Surface**

- 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:** Star Construction Company → No 1 Surface; 1974-04-08 to 1976-02-12; source msha-controller-operator-history
- **controller_controls_mine:** Jones Ernest R → No 1 Surface; 1974-04-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jones Ernest R → Star Construction Company; 1974-04-08 to 1976-02-12; source msha-controller-operator-history
- **controller_controls_mine:** Nixon Virgil O → No 1 Surface; 1976-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** M & N Contracting Company Inc → No 1 Surface; 1976-02-13 to 1976-12-21; source msha-controller-operator-history
- **controller_controls_operator:** Nixon Virgil O → M & N Contracting Company Inc; 1976-02-13 to 1976-12-21; source msha-controller-operator-history
- **operator_operates_mine:** Sugar Creek Coal Company Inc → No 1 Surface; 1976-12-22 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Nelson Joseph W → No 1 Surface; 1976-12-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Nelson Joseph W → Sugar Creek Coal Company Inc; 1976-12-22 to current/open; source msha-controller-operator-history