# Relationship history for MSHA mine 4407426

Current hierarchy: **Bernie  Mason; David  Ison → Appalachian Development LLC → Mill Creek 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:** Bernie  Mason et al → Mill Creek No. 2; 2022-04-17 to 2023-08-14; source msha-controller-operator-history
- **operator_operates_mine:** Appalachian Development LLC → Mill Creek No. 2; 2023-01-30 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bernie  Mason et al → Appalachian Development LLC; 2023-01-30 to 2023-08-14; source msha-controller-operator-history
- **controller_controls_operator:** Gary  Johnson et al → Appalachian Development LLC; 2023-01-30 to 2023-08-14; source msha-controller-operator-history
- **controller_controls_mine:** Bernie  Mason et al → Mill Creek No. 2; 2023-08-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Bernie  Mason et al → Appalachian Development LLC; 2023-08-15 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** David  Ison et al → Appalachian Development LLC; 2023-08-15 to current/open; source msha-controller-operator-history