# Relationship history for MSHA mine 4601418

Current hierarchy: **Charles  Adkins → West Virginia-Tennessee Coal Sales Inc → Sandlick #1**

- 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

- **operator_operates_mine:** United States Steel Mining Company Inc → Sandlick #1; 1950-01-01 to 1990-04-25; source msha-controller-operator-history
- **controller_controls_mine:** Usx Corp → Sandlick #1; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Usx Corp → United States Steel Mining Company Inc; 1950-01-01 to 1990-04-25; source msha-controller-operator-history
- **controller_controls_mine:** Charles  Adkins → Sandlick #1; 1989-06-19 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Dales Contracting → Sandlick #1; 1990-04-26 to 1991-02-28; source msha-controller-operator-history
- **controller_controls_mine:** Roberts Dale → Sandlick #1; 1990-04-26 to 1991-02-28; source msha-controller-operator-history
- **controller_controls_operator:** Roberts Dale → Dales Contracting; 1990-04-26 to 1991-02-28; source msha-controller-operator-history
- **operator_operates_mine:** West Virginia-Tennessee Coal Sales Inc → Sandlick #1; 1991-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Charles  Adkins → West Virginia-Tennessee Coal Sales Inc; 1991-03-01 to current/open; source msha-controller-operator-history