# Relationship history for MSHA mine 0404468

Current hierarchy: **Focused Mining Enterprises LLC → Eagle's Nest Mining LLC → Big Seam mine**

- 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:** John R De Maria → Big Seam mine; 1980-10-01 to 1989-12-31; source msha-controller-operator-history
- **controller_controls_mine:** John R  De Maria Sr → Big Seam mine; 1980-10-01 to 1989-12-31; source msha-controller-operator-history
- **controller_controls_operator:** John R  De Maria Sr → John R De Maria; 1980-10-01 to 1989-12-31; source msha-controller-operator-history
- **operator_operates_mine:** Wildcat Mining LLC → Big Seam mine; 1990-01-01 to 2020-04-21; source msha-controller-operator-history
- **controller_controls_mine:** Richard R  Sykora → Big Seam mine; 1990-01-01 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Richard R  Sykora → Wildcat Mining LLC; 1990-01-01 to 2020-04-21; source msha-controller-operator-history
- **operator_operates_mine:** Eagle's Nest Mining LLC → Big Seam mine; 2020-04-22 to current/open; source msha-controller-operator-history
- **controller_controls_mine:** Focused Mining Enterprises LLC → Big Seam mine; 2020-04-22 to current/open; source msha-controller-operator-history
- **controller_controls_operator:** Focused Mining Enterprises LLC → Eagle's Nest Mining LLC; 2020-04-22 to current/open; source msha-controller-operator-history