# Relationship history for MSHA mine 1502427

Current hierarchy: **Clevinger Dennis & Norman → Clevinger & Raleigh Coal Company → No 3 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Clevinger & Swiney → No 3 Mine; 1950-01-01 to 1975-03-28; source msha-controller-operator-history
- **controller_controls_mine:** Clevinger & Swiney → No 3 Mine; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Clevinger & Swiney → Clevinger & Swiney; 1950-01-01 to 1975-03-28; source msha-controller-operator-history
- **controller_controls_mine:** Clevinger Dennis & Norman → No 3 Mine; 1974-01-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Clevinger & Raleigh Coal Company → No 3 Mine; 1975-03-29 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Clevinger Dennis & Norman → Clevinger & Raleigh Coal Company; 1975-03-29 to current/open; source msha-controller-operator-history