# Relationship history for MSHA mine 1507445

Current hierarchy: **Robert P  Downen; Edward W  Downen → D & T Mining Company Inc → Mine No 1**

- 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:** B & T Coal Company Inc → Mine No 1; 1974-10-01 to 1977-11-07; source msha-controller-operator-history
- **controller_controls_mine:** Cole Wayne C → Mine No 1; 1974-10-01 to 1977-11-07; source msha-controller-operator-history
- **controller_controls_operator:** Cole Wayne C → B & T Coal Company Inc; 1974-10-01 to 1977-11-07; source msha-controller-operator-history
- **operator_operates_mine:** D & T Mining Company Inc → Mine No 1; 1977-11-08 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Robert P  Downen et al → Mine No 1; 1977-11-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Robert P  Downen et al → D & T Mining Company Inc; 1977-11-08 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Edward W  Downen et al → D & T Mining Company Inc; 1977-11-08 to current/open; source msha-controller-operator-history