# Relationship history for MSHA mine 2901986

Current hierarchy: **Brian  Blankenship → R D Blankenship Dirt Work LLC → R D BLANKENSHIP DIRT WORK LLC**

- 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:** Paul E Blankenship Sand & Gravel → R D BLANKENSHIP DIRT WORK LLC; 1985-03-01 to 1994-07-31; source msha-controller-operator-history
- **controller_controls_mine:** Paul E  Blankenship → R D BLANKENSHIP DIRT WORK LLC; 1985-03-01 to 1994-07-31; source msha-controller-operator-history
- **controller_controls_operator:** Paul E  Blankenship → Paul E Blankenship Sand & Gravel; 1985-03-01 to 1994-07-31; source msha-controller-operator-history
- **operator_operates_mine:** R D Blankenship Dirt Work LLC → R D BLANKENSHIP DIRT WORK LLC; 1994-08-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Rodney D  Blankenship → R D BLANKENSHIP DIRT WORK LLC; 1994-08-01 to 2018-12-31; source msha-controller-operator-history
- **controller_controls_operator:** Rodney D  Blankenship → R D Blankenship Dirt Work LLC; 1994-08-01 to 2018-12-31; source msha-controller-operator-history
- **controller_controls_mine:** Rodney D Blankenship et al → R D BLANKENSHIP DIRT WORK LLC; 2019-01-01 to 2022-11-17; source msha-controller-operator-history
- **controller_controls_operator:** Rodney D Blankenship et al → R D Blankenship Dirt Work LLC; 2019-01-01 to 2022-11-17; source msha-controller-operator-history
- **controller_controls_operator:** Brian  Blankenship et al → R D Blankenship Dirt Work LLC; 2019-01-01 to 2022-11-17; source msha-controller-operator-history
- **controller_controls_mine:** Brian  Blankenship → R D BLANKENSHIP DIRT WORK LLC; 2022-11-18 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Brian  Blankenship → R D Blankenship Dirt Work LLC; 2022-11-18 to current/open; source msha-controller-operator-history