# Relationship history for MSHA mine 4405566

Current hierarchy: **Rose Bill R → Big Track Coal Company Inc → No 6**

- 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

- **controller_controls_mine:** Omalene  Deel et al → No 6; 1975-04-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Golden Chip Coal Company Inc → No 6; 1980-10-01 to 1986-05-08; source msha-controller-operator-history
- **controller_controls_operator:** Omalene  Deel et al → Golden Chip Coal Company Inc; 1980-10-01 to 1986-05-08; source msha-controller-operator-history
- **operator_operates_mine:** Big Track Coal Company Inc → No 6; 1986-05-09 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Rose Bill R → No 6; 1986-05-09 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Rose Bill R → Big Track Coal Company Inc; 1986-05-09 to current/open; source msha-controller-operator-history