# Relationship history for MSHA mine 3303726

Current hierarchy: **Jenkins Curtis → Curtis Jenkins Coal Company → Big W No 2**

- 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

- **controller_controls_mine:** Jenkins Curtis Et Al → Big W No 2; 1977-06-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Curtis Jenkins Coal Company → Big W No 2; 1979-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Jenkins Curtis Et Al → Curtis Jenkins Coal Company; 1979-01-01 to current/open; source msha-controller-operator-history