# Relationship history for MSHA mine 1510107

Current hierarchy: **Wright Gilbert → Greenup County Land Company → 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: 2026-10-13T11:19:05.459773+00:00

## Valid-time edges

- **operator_operates_mine:** Greenup County Land Company → No 1 Surface; 1976-11-15 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Wright Gilbert → No 1 Surface; 1976-11-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Wright Gilbert → Greenup County Land Company; 1976-11-15 to current/open; source msha-controller-operator-history