# Relationship history for MSHA mine 2401744

Current hierarchy: **Leischner William T → Big Sky Mining & Development → Five Gallon Bucket**

- 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:** Big Sky Mining & Development → Five Gallon Bucket; 1983-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Leischner William T → Five Gallon Bucket; 1983-09-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Leischner William T → Big Sky Mining & Development; 1983-09-01 to current/open; source msha-controller-operator-history