# Relationship history for MSHA mine 1515614

Current hierarchy: **Poteet J W → Harlan-Darby Coal Company Inc → No 2**

- 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:** Laurel Branch Coal Company Inc → No 2; 1986-05-01 to 1986-09-21; source msha-controller-operator-history
- **controller_controls_mine:** Donald  Nicewonder → No 2; 1986-05-01 to 1986-09-21; source msha-controller-operator-history
- **controller_controls_operator:** Donald  Nicewonder → Laurel Branch Coal Company Inc; 1986-05-01 to 1986-09-21; source msha-controller-operator-history
- **operator_operates_mine:** Harlan-Darby Coal Company Inc → No 2; 1986-09-22 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Poteet J W → No 2; 1986-09-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Poteet J W → Harlan-Darby Coal Company Inc; 1986-09-22 to current/open; source msha-controller-operator-history