# Relationship history for MSHA mine 4606615

Current hierarchy: **Muncy Dennis → Local Boys Mining Corp → Yukon**

- 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:** Ruth  Prater  et al → Yukon; 1978-06-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Coal Enterprises Inc → Yukon; 1982-10-01 to 1985-06-08; source msha-controller-operator-history
- **controller_controls_operator:** Ruth  Prater  et al → Coal Enterprises Inc; 1982-10-01 to 1985-06-08; source msha-controller-operator-history
- **operator_operates_mine:** Local Boys Mining Corp → Yukon; 1985-06-09 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Muncy Dennis → Yukon; 1985-06-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Muncy Dennis → Local Boys Mining Corp; 1985-06-09 to current/open; source msha-controller-operator-history