# Relationship history for MSHA mine 4405623

Current hierarchy: **Deel Ernie → Four D Coal Company Inc → 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: 2026-10-17T05:35:58.500035+00:00

## Valid-time edges

- **controller_controls_mine:** Susie A  Smith et al → No 2; 1979-10-31 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Kyn Coal Company Inc → No 2; 1981-04-01 to 1981-07-16; source msha-controller-operator-history
- **controller_controls_operator:** Susie A  Smith et al → Kyn Coal Company Inc; 1981-04-01 to 1981-07-16; source msha-controller-operator-history
- **controller_controls_operator:** Elmer  Fuller et al → Kyn Coal Company Inc; 1981-04-01 to 1981-07-16; source msha-controller-operator-history
- **controller_controls_mine:** Deel Ernie → No 2; 1981-06-01 to current/open; source msha-controller-operator-history
- **operator_operates_mine:** Four D Coal Company Inc → No 2; 1981-07-17 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Deel Ernie → Four D Coal Company Inc; 1981-07-17 to current/open; source msha-controller-operator-history