# Relationship history for MSHA mine 1513255

Current hierarchy: **Thurman  Harness → Harness Coal Inc → Harness Coal No 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

- **controller_controls_mine:** White Sarah → Harness Coal No 1; 1981-01-01 to 1983-01-09; source msha-controller-operator-history
- **operator_operates_mine:** A & S Coal Company Inc → Harness Coal No 1; 1981-11-01 to 1982-06-26; source msha-controller-operator-history
- **controller_controls_operator:** White Sarah → A & S Coal Company Inc; 1981-11-01 to 1982-06-26; source msha-controller-operator-history
- **operator_operates_mine:** Mor-Coal Inc → Harness Coal No 1; 1982-06-27 to 1983-04-04; source msha-controller-operator-history
- **controller_controls_mine:** Morgan Thomas J → Harness Coal No 1; 1982-06-27 to 1983-04-04; source msha-controller-operator-history
- **controller_controls_operator:** Morgan Thomas J → Mor-Coal Inc; 1982-06-27 to 1983-04-04; source msha-controller-operator-history
- **operator_operates_mine:** Harness Coal Inc → Harness Coal No 1; 1983-04-05 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Thurman  Harness → Harness Coal No 1; 1983-04-05 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Thurman  Harness → Harness Coal Inc; 1983-04-05 to current/open; source msha-controller-operator-history