# Relationship history for MSHA mine 1505269

Current hierarchy: **Johnson R B → Alma Coal Corp → Pikeville No 2 Dock**

- 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

- **operator_operates_mine:** Dixie Mining Company → Pikeville No 2 Dock; 1950-01-01 to 1979-02-28; source msha-controller-operator-history
- **controller_controls_mine:** Roberts C D & Josephine R Venters → Pikeville No 2 Dock; 1950-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Roberts C D & Josephine R Venters → Dixie Mining Company; 1950-01-01 to 1979-02-28; source msha-controller-operator-history
- **controller_controls_mine:** Johnson R B → Pikeville No 2 Dock; 1976-12-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Alma Coal Corp → Pikeville No 2 Dock; 1979-03-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Johnson R B → Alma Coal Corp; 1979-03-01 to current/open; source msha-controller-operator-history