# Relationship history for MSHA mine 1510190

Current hierarchy: **Ratliff Bernie → Praise Elkhorn Coal Corp → No 1 Mine**

- 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:** Praise Elkhorn Coal Corp → No 1 Mine; 1977-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Ratliff Bernie → No 1 Mine; 1977-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Ratliff Bernie → Praise Elkhorn Coal Corp; 1977-01-01 to current/open; source msha-controller-operator-history