# Relationship history for MSHA mine 4001869

Current hierarchy: **Rhodes Darrel → Bimco Of Tennessee → 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **operator_operates_mine:** Turner Mining Company → No 1 Surface; 1975-10-07 to 1976-04-30; source msha-controller-operator-history
- **controller_controls_mine:** Turner Oval → No 1 Surface; 1975-10-07 to 1976-04-30; source msha-controller-operator-history
- **controller_controls_operator:** Turner Oval → Turner Mining Company; 1975-10-07 to 1976-04-30; source msha-controller-operator-history
- **operator_operates_mine:** Bimco Of Tennessee → No 1 Surface; 1976-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Rhodes Darrel → No 1 Surface; 1976-05-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Rhodes Darrel → Bimco Of Tennessee; 1976-05-01 to current/open; source msha-controller-operator-history