# Relationship history for MSHA mine 1511714

Current hierarchy: **Nesbit William A Iii → Green Grove Coal Company → Green Grove 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

- **controller_controls_mine:** Nesbit William A Iii → Green Grove No 2; 1975-02-04 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Mc Gaw John Scott → Green Grove No 2; 1976-03-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Dawn Coal Company → Green Grove No 2; 1978-12-01 to 1979-12-09; source msha-controller-operator-history
- **controller_controls_operator:** Mc Gaw John Scott → Dawn Coal Company; 1978-12-01 to 1979-12-09; source msha-controller-operator-history
- **operator_operates_mine:** Green Grove Coal Company → Green Grove No 2; 1979-12-10 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Nesbit William A Iii → Green Grove Coal Company; 1979-12-10 to current/open; source msha-controller-operator-history