# Relationship history for MSHA mine 0404393

Current hierarchy: **David  Yampol → Red Ledge Mining Company → Red Ledge Mining Co.**

- 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

- **operator_operates_mine:** Red Ledge Mining Company Inc → Red Ledge Mining Co.; 1980-03-01 to 1996-08-14; source msha-controller-operator-history
- **controller_controls_mine:** Red Ledge Mining Company Inc → Red Ledge Mining Co.; 1980-03-01 to 1996-08-14; source msha-controller-operator-history
- **controller_controls_operator:** Red Ledge Mining Company Inc → Red Ledge Mining Company Inc; 1980-03-01 to 1996-08-14; source msha-controller-operator-history
- **operator_operates_mine:** Red Ledge Mining Company → Red Ledge Mining Co.; 1996-08-15 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Barry  Yampol et al → Red Ledge Mining Co.; 1996-08-15 to 2026-06-05; source msha-controller-operator-history
- **controller_controls_operator:** Barry  Yampol et al → Red Ledge Mining Company; 1996-08-15 to 2026-06-05; source msha-controller-operator-history
- **controller_controls_operator:** David  Yampol et al → Red Ledge Mining Company; 1996-08-15 to 2026-06-05; source msha-controller-operator-history
- **controller_controls_mine:** David  Yampol → Red Ledge Mining Co.; 2026-06-06 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** David  Yampol → Red Ledge Mining Company; 2026-06-06 to current/open; source msha-controller-operator-history