# Relationship history for MSHA mine 1513766

Current hierarchy: **Clevinger Jerry W & Billy Ramey → Clevinger & Ramey Coal Company → No 3**

- 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:** Clevinger Jerry W & Billy Ramey → No 3; 1979-04-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Clevinger & Ramey Coal Company → No 3; 1982-10-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Clevinger Jerry W & Billy Ramey → Clevinger & Ramey Coal Company; 1982-10-01 to current/open; source msha-controller-operator-history